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Ch.5.less.5.how do weathering and erosion shape the land

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  • 1. How do weathering and erosion shape the land? UNIT C: CHAPTER 5: LESSON 5:
  • 2. Weathering  The process in which rocks or other materials are broken down.
  • 3. Different types of weathering: Physical weathering Chemical weathering
  • 4. Physical Weathering: Physical weathering is caused by: 1) Temperature changes (Causes rocks to crack)
  • 5. 2) Plant roots growing in rocks breaking the rocks.
  • 6. 3) Water freezing in cracks between rocks cause the rocks to break apart.
  • 7. 4) Rubbing
  • 8. 5) Animals making burrows.
  • 9. Chemical Weathering: Occurs when chemicals break down the rocks. 1) Water dissolves rocks. The agents of chemical weathering:
  • 10. 2) Acid Rain Formed when gases from factories combine with rain water.
  • 11. Erosion  The process by which water, ice, wind or gravity moves fragments of rock and soil.
  • 12. If a particle is loosened by weathering, but stays put, its just weathering. If it starts moving, its Erosion.
  • 13. Water Erosion  Rivers, streams, and runoff
  • 14. Ice Erosion  Glaciers
  • 15. Wind Erosion
  • 16. Mass Movements  Landslides, mudslides, slump and creep
  • 17. Get out a piece of paper and identify if the following involve weathering, erosion, both, or neither.
  • 18. Ready? 1.Waves are crashing on a sand beach. 2.Water expands as it freezes in the cracks of rocks. 3. Pebbles move down a stream with the current.
  • 19. 4. Acid rain causes the decomposition of a statue in New York. 5. A man shovels dirt to plant a tree. 6. A Glacier slowly moves down a mountain. 7. A tree’s roots grow into the cracks of rocks. 8. A major volcano erupts.
  • 20. 9. A boy takes out the garbage for his mother. 10. A shovel is left outside and begins to rust. Once you’ve answered these, discuss you’re answers with the rest of the class before you go on.
  • 21. Let’s Discuss The Questions. 1. As the sand is moving there is definitely erosion; there is also abrasion from the sand gains colliding. Both
  • 22. 2. This is frost wedging so it’s mechanical weathering. There is no mention of movement. Weathering
  • 23. 3. There is probably some weathering, but there is definitely erosion. Erosion or Both
  • 24. 4. Acid rain on a statue is chemical weathering. This is mainly Weathering.
  • 25. 5. Since the man is transporting Earth materials, it’s Erosion.
  • 26. 6. A glacier moving down a mountain would have both weathering and erosion. Both
  • 27. 7. A tree’s roots growing into cracks of rocks would be weathering. Weathering
  • 28. 8. A major volcanic eruption would involve both weathering and erosion. Both
  • 29. 9. Unless the garbage has “Earth Material” or dirt in it there is probably no erosion or weathering. Neither
  • 30. 10. The rusting of a shovel is oxidation. This is chemical weathering. Weathering
  • 31. The process by which materials are dropped off at another place is called: Deposition
  • 32. Erosion and deposition work together to change the shape of the earth’s surface.
  • 33. Ways that erosion and deposition work together: 1) Running water Slow moving water Deposition Fast moving water Erosion
  • 34. 2) Waves Headland Land surrounded by water from 3 sides.
  • 35. When waves reach a headland they curve around it and wash away at the sides of the headland.
  • 36. 3) Wind Wind erodes sand and rock, when the wind slows down the sand and rock get deposited.
  • 37. How can people protect shorelines?  Shorelines may be damaged when more sand is eroded than deposited.
  • 38. People can protect shorelines by:  1) Building dams (to change the speed and direction of water)
  • 39.  2) Building levees (prevent floods)
  • 40.  3) Building barricades (prevent beach erosion)
  • 41.  4) Building fences (prevent sand erosion by wind)

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