{"id":4714,"date":"2023-08-20T12:16:42","date_gmt":"2023-08-20T12:16:42","guid":{"rendered":"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/?post_type=lesson_page&#038;p=4714"},"modified":"2023-10-15T13:05:59","modified_gmt":"2023-10-15T13:05:59","slug":"3-3-is-the-problem-changing","status":"publish","type":"lesson_page","link":"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/lesson_page\/3-3-is-the-problem-changing\/","title":{"rendered":"3.3 Is the Problem Changing?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4714\" class=\"elementor elementor-4714\" data-elementor-post-type=\"lesson_page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-00fc7d1 e-flex e-con-boxed e-con e-parent\" data-id=\"00fc7d1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f2e570a elementor-widget elementor-widget-text-editor\" data-id=\"f2e570a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Teacher &amp; Student Materials &gt; <a href=\"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/learning_unit\/quenching-a-thirsty-planet-teacher-and-student-materials\/\">Quenching a Thirsty Planet<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-975ddfc elementor-widget elementor-widget-heading\" data-id=\"975ddfc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">3.3 Is the Problem Changing?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-bc735d4 e-flex e-con-boxed e-con e-parent\" data-id=\"bc735d4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3054e07 e-con-full e-flex e-con e-parent\" data-id=\"3054e07\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3428bb7 elementor-widget elementor-widget-heading\" data-id=\"3428bb7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Lesson Overview<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-607d20c elementor-widget elementor-widget-heading\" data-id=\"607d20c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Guiding question:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-11a9ce8 elementor-widget elementor-widget-text-editor\" data-id=\"11a9ce8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Is the problem changing?<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0e64c2f e-flex e-con-boxed e-con e-parent\" data-id=\"0e64c2f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6122d4f elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"6122d4f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-user-clock\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Time Estimate:<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ff7966 elementor-widget elementor-widget-text-editor\" data-id=\"5ff7966\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>3 hours<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cfa3b7e elementor-widget elementor-widget-heading\" data-id=\"cfa3b7e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Purpose:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-84c3e42 elementor-widget elementor-widget-text-editor\" data-id=\"84c3e42\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Although the necessity for water has always played a part in human civilization, current cultural trends, climate change, and population growth are exacerbating the crisis.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a58abbd elementor-widget elementor-widget-heading\" data-id=\"a58abbd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Overview:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1dc9067 elementor-widget elementor-widget-text-editor\" data-id=\"1dc9067\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Students will use their revised water cycle models to explore the connections between social factors, scientific forces, and the changing water cycle better to grasp the magnitude and complexity of the issue.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1798e55 elementor-widget elementor-widget-heading\" data-id=\"1798e55\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Design Principles:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c0e0f59 elementor-widget elementor-widget-text-editor\" data-id=\"c0e0f59\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Global and local dynamic<\/li><li>Public Data<\/li><li>Modeling<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0aa956a elementor-widget elementor-widget-heading\" data-id=\"0aa956a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Background Knowledge:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b58a2f6 elementor-widget elementor-widget-text-editor\" data-id=\"b58a2f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>An understanding of how water moves through Earth\u00a0<\/li><li>A superficial understanding of the ways the water cycle changes as a result of human activity (covered in lesson 3.2)<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-535fffd elementor-widget elementor-widget-heading\" data-id=\"535fffd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Common Misconceptions:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-156617e elementor-widget elementor-widget-text-editor\" data-id=\"156617e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NA<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab16add elementor-widget elementor-widget-heading\" data-id=\"ab16add\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Safety:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-682929a elementor-widget elementor-widget-text-editor\" data-id=\"682929a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NA<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fd62567 elementor-widget elementor-widget-heading\" data-id=\"fd62567\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Unit Connections:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-88f5d23 elementor-widget elementor-widget-text-editor\" data-id=\"88f5d23\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NA<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-baafbb9 e-con-full e-flex e-con e-parent\" data-id=\"baafbb9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2bcc8c3 elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"2bcc8c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"64\" height=\"65\" viewBox=\"0 0 64 65\" fill=\"none\"><ellipse cx=\"32\" cy=\"32.3855\" rx=\"32\" ry=\"32.3855\" fill=\"#3C5E8C\"><\/ellipse><circle cx=\"32.0602\" cy=\"32.0602\" r=\"24.0602\" stroke=\"white\" stroke-width=\"2\"><\/circle><g clip-path=\"url(#clip0_924_5892)\"><path d=\"M46.6088 33.0554C46.3926 33.0554 46.217 33.2325 46.217 33.4504V44.4226C46.217 44.8572 45.8664 45.2107 45.4352 45.2107H17.5647C17.1336 45.2107 16.7829 44.8572 16.7829 44.4226V33.4504C16.7829 33.2325 16.6073 33.0554 16.3912 33.0554C16.175 33.0554 15.9994 33.2325 15.9994 33.4504V44.4226C15.9994 45.2924 16.7013 46 17.5641 46H45.4346C46.2975 46 46.9994 45.2924 46.9994 44.4226V33.4504C46.9994 33.2325 46.8244 33.0554 46.6076 33.0554H46.6088Z\" fill=\"white\"><\/path><path d=\"M45.4353 24.4079H17.5647C16.7019 24.4079 16 25.1155 16 25.9854V30.7337C16 31.205 16.2643 31.7557 16.6156 32.015C17.9089 32.9725 21.7121 35.2131 29.2692 35.5755V37.7848C29.2692 38.0027 29.4442 38.1797 29.661 38.1797H33.3402C33.5564 38.1797 33.732 38.0027 33.732 37.7848V35.5661C41.2849 35.1741 45.0881 32.9583 46.3815 32.0127C46.7345 31.7545 47.0006 31.2044 47.0006 30.7325V25.9842C47.0006 25.1143 46.2987 24.4068 45.4358 24.4068L45.4353 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19.7171 34.2371 19 31.5 19C28.7629 19 26.4369 19.7354 25.2645 21.0174C25.1981 21.0902 25.1611 21.1856 25.1611 21.285V23.12C25.1611 23.338 25.3362 23.515 25.5529 23.515C25.7696 23.515 25.9447 23.338 25.9447 23.12V21.4449C27.0008 20.3915 29.0125 19.7905 31.5006 19.7905C33.9887 19.7905 35.9375 20.3773 37.0159 21.4064V23.1206C37.0159 23.3385 37.191 23.5156 37.4077 23.5156L37.4065 23.5144Z\" fill=\"white\"><\/path><\/g><defs><clipPath id=\"clip0_924_5892\"><rect width=\"31\" height=\"27\" fill=\"white\" transform=\"translate(16 19)\"><\/rect><\/clipPath><\/defs><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Materials<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c981d2b elementor-widget elementor-widget-heading\" data-id=\"c981d2b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Teacher<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-588ea17 elementor-widget elementor-widget-text-editor\" data-id=\"588ea17\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Teacher PowerPoint titled: 3.3 Has this problem always existed?\u00a0<ul><li>A ~20 minute movie is on slide 13. Make sure it is loaded.\u00a0<\/li><\/ul><\/li><li>Water Cycle Models<\/li><li>Lesson Set 3 Answer Keys<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3107d94 elementor-widget elementor-widget-heading\" data-id=\"3107d94\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Student<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5620247 elementor-widget elementor-widget-text-editor\" data-id=\"5620247\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Student Resources:\u00a0<ul><li>National Geographic Article: \u201cHow Climate Change Impacts Water Access\u201d\u00a0<\/li><li>Infographic: \u201cHow Climate Change Impacts Weather\u201d<\/li><li>Diagram: \u201cEffects of Climate Change on Water\u201d<\/li><\/ul><\/li><li>A device to access student resources (resources can be printed, but they will show up better digitally)<\/li><li>Student Worksheet: Deforestation &amp; The Hydrologic Cycle<\/li><li>Students&#8217; previous water cycle models<\/li><li>Paper to revise water cycle models<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-122beee elementor-widget elementor-widget-heading\" data-id=\"122beee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Optional<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0ebfb89 elementor-widget elementor-widget-text-editor\" data-id=\"0ebfb89\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Applying your model additional practice<\/li><li><em>Netflix Explained: The World\u2019s Water Crisis Movie Guide<\/em><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1e6fec0 e-flex e-con-boxed e-con e-parent\" data-id=\"1e6fec0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ebc325a elementor-widget elementor-widget-heading\" data-id=\"ebc325a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Instructional Sequence<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-75f24c6 e-flex e-con-boxed e-con e-parent\" data-id=\"75f24c6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-7daddc7 e-con-full e-flex e-con e-parent\" data-id=\"7daddc7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c7885aa elementor-widget elementor-widget-heading\" data-id=\"c7885aa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How population growth, climate change, and the water cycle are connected: (slides 11-12)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e968e1c elementor-widget elementor-widget-text-editor\" data-id=\"e968e1c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Materials: Teacher Powerpoint: 3.3 Has this problem always existed?; Student Resources; water cycle models<\/p><p>Optional Materials: Applying the Model<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e1e36ad elementor-widget elementor-widget-text-editor\" data-id=\"e1e36ad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In this activity, students will get practice applying their newly revised water cycle model to answer a question. Students will read a short passage, look at an infographic, and a water cycle diagram as a small group.\u00a0<\/p><p>They will then individually construct an explanation to explain how population growth, climate change, and the water cycle are all connected.\u00a0<\/p><ol><li>Each group member will share to the rest of the group.\u00a0<\/li><li>Those listening will provide feedback.\u00a0<\/li><li>After every person has shared, make any necessary revisions to your model. Students will need it in the next activity.\u00a0<\/li><\/ol><p>Students can go from one explanation to the other on their own or wait for the teacher&#8217;s direction.\u00a0<\/p><p>\u00a0<\/p><p>Students practice applying their water cycle models before being assessed on it in the next activity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ced884f e-con-full e-flex e-con e-parent\" data-id=\"ced884f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-316fcb1 e-flex e-con-boxed e-con e-parent\" data-id=\"316fcb1\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cc77ac6 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"cc77ac6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"64\" height=\"64\" src=\"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/wp-content\/uploads\/sites\/2\/2023\/07\/Notes-Blue-1.png\" class=\"attachment-full size-full wp-image-3691\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ed431a2 elementor-widget elementor-widget-text-editor\" data-id=\"ed431a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Slides 1-10 are optional. They are included in the slide deck in case students are struggling with how to represent what they know of the water cycle.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-513e6a8 e-flex e-con-boxed e-con e-parent\" data-id=\"513e6a8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2fe0001 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"2fe0001\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"64\" height=\"64\" src=\"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/wp-content\/uploads\/sites\/2\/2023\/07\/Icon_Notes-Coral.png\" class=\"attachment-full size-full wp-image-3690\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-156e38d elementor-widget elementor-widget-text-editor\" data-id=\"156e38d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Small group discussion<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0641619 e-flex e-con-boxed e-con e-parent\" data-id=\"0641619\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-adccb5e elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"adccb5e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"64\" height=\"64\" src=\"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/wp-content\/uploads\/sites\/2\/2023\/07\/Enrichment-1.png\" class=\"attachment-full size-full wp-image-4473\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0bb8db4 elementor-widget elementor-widget-text-editor\" data-id=\"0bb8db4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>DP- Modeling<\/strong><\/p><p>\u00a0<\/p><p>It is important that students have the opportunity to try to represent their knowledge of the water cycle models on their own before seeing the slides 1-10 because it will help them negotiate their new knowledge with what they already know in more meaningful ways.<\/p><p>\u00a0<\/p><p>Additionally, the true value of modeling lies in its application. By teaching students to apply their models, teachers empower them to use their knowledge and skills to address real-world questions and make predictions about various phenomena.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6e1d5f6 e-flex e-con-boxed e-con e-parent\" data-id=\"6e1d5f6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-362abd9 e-con-full e-flex e-con e-parent\" data-id=\"362abd9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0271c4b elementor-widget elementor-widget-heading\" data-id=\"0271c4b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Watch Netflix Explained: The World\u2019s Water Crisis<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cccf91f elementor-widget elementor-widget-text-editor\" data-id=\"cccf91f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Materials: Optional: video guide<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a14fb2d elementor-widget elementor-widget-text-editor\" data-id=\"a14fb2d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This video sums up the previous three lesson sets. We recommend just allowing students to watch it, but if students need a video guide, one is provided in the optional materials.<\/p><p>\u00a0<\/p><p>Debrief questions:\u00a0<\/p><ul><li>What are the benefits of valuing water at a higher price?\u00a0<\/li><li>What was the problem in Mexico with the brewing company?\u00a0<\/li><li>What is desalination? Why do we do it? What are the obstacles to desalination?\u00a0<\/li><li>What are the benefits and disadvantages of using surface water? What about ground water?<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-657aa13 e-con-full e-flex e-con e-parent\" data-id=\"657aa13\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4c453f2 e-flex e-con-boxed e-con e-parent\" data-id=\"4c453f2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-a984add e-con-full e-flex e-con e-parent\" data-id=\"a984add\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fa307e3 elementor-widget elementor-widget-heading\" data-id=\"fa307e3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Student worksheet: Deforestation &amp; The Water Cycle<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1e6850 elementor-widget elementor-widget-text-editor\" data-id=\"d1e6850\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Materials: 3.3 Deforestation &amp; The Water Cycle<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-06fe665 elementor-widget elementor-widget-text-editor\" data-id=\"06fe665\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>It is recommended that students work independently on this assignment since so much of their other work is group-based. The last question will provide the teacher with a clue as to how well students understand the water cycle.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-73d6ab3 e-con-full e-flex e-con e-parent\" data-id=\"73d6ab3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-bcb3086 e-con-full e-flex e-con e-parent\" data-id=\"bcb3086\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-6970f08 e-con-full e-flex e-con e-parent\" data-id=\"6970f08\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-efc3347 elementor-widget elementor-widget-heading\" data-id=\"efc3347\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Information for Planning &amp; Teaching <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba5ef87 elementor-widget elementor-widget-text-editor\" data-id=\"ba5ef87\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Background Knowledge<\/li><li>Lesson Timing<\/li><li>Student ideas &amp; Experiences<\/li><li>Science Practices<\/li><li>Teaching Cases<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d3069b0 elementor-widget elementor-widget-heading\" data-id=\"d3069b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Background Knowledge:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aa403d8 elementor-widget elementor-widget-text-editor\" data-id=\"aa403d8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Water has always played a vital role in human civilization, but the current state of the world presents new challenges to its availability. Cultural trends, climate change, and population growth are exacerbating the water crisis, amplifying its magnitude and complexity. Cultural shifts, such as industrialization and urbanization, have led to increased water demands and altered patterns of water usage. Climate change, driven by factors like rising temperatures and changing precipitation patterns, disrupts the natural water cycle, affecting the distribution and availability of water resources. Additionally, rapid population growth puts additional strain on water supplies, particularly in regions already facing water scarcity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e738a8 elementor-widget elementor-widget-heading\" data-id=\"3e738a8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Lesson Timing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f79efaf e-flex e-con-boxed e-con e-parent\" data-id=\"f79efaf\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4063e07 elementor-widget elementor-widget-text-editor\" data-id=\"4063e07\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table class=\"table-responsive\"><thead><tr class=\"header\"><th class=\"th-guiding-question\">Day<\/th><th class=\"th-topic\"><strong data-renderer-mark=\"true\">Activity<\/strong><\/th><th class=\"th-time\">Potential Modifications<\/th><\/tr><\/thead><tbody><tr><td class=\"td-guiding-question\">Day 1<\/td><td class=\"td-topic\">How population growth, climate change, and the water cycle are connected (slides 11-12)<\/td><td class=\"td-time\"><p>Slides 1-10 are only for if students are struggling to make sophisticated water cycle models<\/p><p>To save time, students can do the activity as a group, but they each need to make sure their models are going to help them in the next independent activity.<\/p><\/td><\/tr><tr><td class=\"td-guiding-question\">Day 2<\/td><td class=\"td-topic\">3.3 Deforestation &amp; The Water Cycle<\/td><td class=\"td-time\"><p data-renderer-start-pos=\"21541\">Can be completed as homework if appropriate for your students<\/p><\/td><\/tr><tr><td class=\"td-guiding-question\">Day 3<\/td><td class=\"td-topic\"><p data-renderer-start-pos=\"21711\">Watch Netflix Explained: The World\u2019s Water Crisis<\/p><\/td><td class=\"td-time\"><p data-renderer-start-pos=\"22256\">This documentary is about 20 minutes long and can be skipped if necessary, however, it wonderfully sums up everything we\u2019ve learned so far. The next lesson set will start with information from the documentary, so be sure to read the background information to be prepared.<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62f952b elementor-widget elementor-widget-heading\" data-id=\"62f952b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Student ideas &amp; Experiences<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b074cd elementor-widget elementor-widget-text-editor\" data-id=\"0b074cd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NA<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0f460ec elementor-widget elementor-widget-heading\" data-id=\"0f460ec\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Science Practices<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-77bf74e elementor-widget elementor-widget-text-editor\" data-id=\"77bf74e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Developing a model is only part of the science and engineering practice; students must also use their models to answer questions and make predictions. By teaching students to use their models to explain changes in the water cycle, teachers empower them to connect theoretical knowledge with real-world phenomena and develop a comprehensive understanding of the topic.<\/p><p>\u00a0<\/p><p>Applying models to explain changes in the water cycle enables students to explore cause-and-effect relationships, identify patterns, and make predictions about how different factors can influence the cycle. It encourages critical thinking as students analyze data, interpret observations, and draw conclusions based on their models. By engaging in this process, students develop a deeper appreciation for the dynamic nature of the water cycle and the factors that can impact its balance and stability.<\/p><p>\u00a0<\/p><p>The application of models fosters a sense of relevance and ownership among students. It allows them to see the practical implications of their models and how they can be used to explain real-world phenomena such as droughts, floods, or shifts in precipitation patterns. Through this application, students develop a more holistic understanding of the water cycle and its importance in sustaining ecosystems, supporting human activities, and addressing pressing environmental challenges.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2cc26aa elementor-widget elementor-widget-heading\" data-id=\"2cc26aa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Teaching Cases<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-53c3581 elementor-widget elementor-widget-text-editor\" data-id=\"53c3581\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NA<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4345ea7 elementor-widget elementor-widget-post-info\" data-id=\"4345ea7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-1e391ec elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-cloud-upload-alt\"><\/i>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-custom\">\n\t\t\t\t\t\t\t\t\t\tOctober 15, 2023\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Teacher &amp; Student Materials &gt; Quenching a Thirsty Planet Lesson Overview Guiding question: Is the problem changing? Time Estimate: 3 hours Purpose: Although the necessity for water has always played a part in human civilization, current cultural trends, climate change, and population growth are exacerbating the crisis. Overview: Students will use their revised water cycle [&hellip;]<\/p>\n","protected":false},"featured_media":0,"parent":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false},"categories":[],"tags":[],"class_list":["post-4714","lesson_page","type-lesson_page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3.3 Is the Problem Changing? - grand-challenges<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/stweizmann.proj.ac.il\/grand-challenges\/lesson_page\/3-3-is-the-problem-changing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3.3 Is the Problem Changing? - grand-challenges\" \/>\n<meta property=\"og:description\" content=\"Teacher &amp; Student Materials &gt; Quenching a Thirsty Planet Lesson Overview Guiding question: Is the problem changing? 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