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4th Grade Ch 9 Lesson 2 How Do Weathered Materials Move


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4th Grade Ch 9 Lesson 2 How Do Weathered Materials Move

  1. 1. Ch. 9 Lesson 2 How do weathered materials move?
  2. 2. erosion <ul><li>process of moving weathered rock by water, wind, ice & gravity </li></ul><ul><li>creates canyons & valleys </li></ul>
  3. 3. <ul><li>Waves constantly change the shape of the shoreline. </li></ul>
  4. 5. Rivers can make deep canyons by erosion. Grand Canyon
  5. 6. glacier <ul><li>large ice sheet in cold place </li></ul><ul><li>causes erosion </li></ul>
  6. 7. Glaciers
  7. 8. As a glacier melts, it wears away bits of rock and soil.
  8. 9. Glaciers [02:40]
  9. 10. deposition <ul><li>laying down of pieces of Earth’s surface </li></ul><ul><li>creates deltas – fan shaped area of land </li></ul>Weathering and Erosion YouTube video
  10. 11. River deltas
  11. 12. sand dunes
  12. 13. <ul><li>rapid downhill movement of a large amount of rock & soil - caused by gravity </li></ul>landslide
  13. 14. landslide
  14. 15. avalanche <ul><li>large amounts of snow & ice that fall rapidly down a mountain </li></ul>
  15. 16. Avalanche Control Team in Anchorage [03:34]
  16. 17. avalanche
  17. 18. ways to help reduce erosion <ul><li>grow plants on hills to prevent erosion </li></ul>
  18. 19. ways to help reduce erosion <ul><li>terracing - slows speed of rainfall </li></ul>
  19. 20. terracing building of step like ridges in hilly areas to prevent water runoff
  20. 21. ways to help reduce erosion <ul><li>build barriers to prevent waves </li></ul>
  21. 22. 2 ways to stop erosion of sand 1. jetty 2. sea wall
  22. 23. Fort Lauderdale beach sea wall
  23. 24. seawall
  24. 25. Activity- At the Beach <ul><li>Problem : How do waves affect the beach? </li></ul><ul><li>Hypothesis: I predict that the waves will affect the beach by _____. I predict that a jetty will help by _______. </li></ul><ul><li>Procedure: </li></ul><ul><li>Shape sand into a beach. </li></ul><ul><li>Pour water into side of pan opposite beach. </li></ul><ul><li>Make waves with popsicle stick. </li></ul><ul><li>Make beach again. </li></ul><ul><li>Make a jetty by piling pebbles in a line in middle of tray. </li></ul><ul><li>Make waves with popsicle stick. </li></ul><ul><li>Observations: </li></ul>
  25. 26. Activity-Hills & Valleys <ul><li>Problem: How does moving water shape the </li></ul><ul><li>land ? </li></ul><ul><li>Hypothesis: I predict that moving water (rain) </li></ul><ul><li>will cause the salt (mineral) to __________. </li></ul><ul><li>Observations: _________________________ </li></ul><ul><li>Conclusion: ___________________________ </li></ul>