The lessons in the Disappearing Dunes Unit help students make sense of how different landforms on earth change over time. Lesson 1 introduces students to dunes and Lesson 2 has students conduct an investigation of how wind and water can change dunes. In Lesson 3, students make predictions about how they think other landforms (e.g., Hoodoos, Arches, Volcanoes, and Glaciers) change over time. In Lessons 4, 5, and 6 students develop models and physical maps of the landform changes. Building on the observed changes outlined in the maps, students discuss how fast or slow the changes can occur to dunes, specifically, in Lesson 7. In Lesson 8, they discuss how fast or slow the changes can occur to other landforms, while also developing physical maps of those landforms. In Lessons 9, 10, and 11, students build on their understanding of landform changes to engage in engineering design where they design, build, and test ways to prevent wind and water from changing dunes. They end the unit, by communicating their designs with others in Lesson 11. | 
