In this activity students will use playdough to build 3D models of Earth’s crust to observe how it bends and folds as a result of tectonic stress. These formations, when found in nature, give geologists a picture of how Earth has formed and changed over geological time. Materials 3-4 colors of playdough or soft clay – Download Recipe Butter knife (metal or plastic) Colored pencils or crayons Student worksheet – Download | View on Google Docs Teacher answer key – Download | View on Google Docs M