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Erosion & Deposition

Erosion & Deposition. DEFINITIONS. EROSION. Erosion= movement of sediment by ice, wind, water, or gravity Is erosion constructive, destructive, or both? Why?. Erosion wears down Earth’s surface. Erosion is a destructive force. gully. river valley. Ice (Glaciers)

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Erosion & Deposition

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  1. Erosion & Deposition

  2. DEFINITIONS

  3. EROSION • Erosion= movement of sediment by ice, wind, water, or gravity • Is erosion constructive, destructive, or both? Why?

  4. Erosion wears down Earth’s surface Erosion is a destructive force. gully river valley

  5. Ice (Glaciers) Glaciers carry materials along as they move forward CAUSES of EROSION

  6. ICE EROSION EFFECTS ICE a. “U” shaped Valley b. Flat Plains

  7. WIND carries (blows) sediments and soil from one place to another CAUSES of EROSION

  8. WIND EROSION EFFECTS WIND a.Reshaped surfaces b.Sand storms c.Dust storms

  9. EROSION EFFECTS

  10. Moving waterin streams & rivers carries sediments along as it moves down stream. The faster the water, the more and the heavier material it can carry CAUSES of EROSION

  11. WATER EROSION EFFECTS KARST Landscape Karst is an area of land that is mostly made of limestone & because of this usually has a lot of caves & sinkholes.

  12. WATER EROSION EFFECTS caves

  13. WATER EROSION EFFECTS Caves are formed when rock is chemically dissolved and carried away by groundwater or underground rivers leaving “holes” in the rock.

  14. WATER EROSION EFFECTS Sinkholes form when the rock underneath the soil, is eroded away & the and above sinks because it is no longer supported sinkholes

  15. WATER EROSION EFFECTS River valleys & canyons are formed when fast moving rivers erode the land over long periods of time.

  16. EROSION EFFECTS Floodplains are formed over time when a river or stream overflows its regular banks and erodes the land around it.

  17. CAUSES of EROSION • Gravity • Causes water and glaciers to move downhill • particles (sediments, dust, soil, etc.) carried by water and wind to settle on bottom on stream or the ground

  18. GRAVITY EROSION EFFECTS Mass Movement Mudflows Landslides

  19. DEFINITIONS

  20. Deposition • Deposition= build up of land through the dropping off of sediments that are being carried by ice, wind, water or gravity • Is deposition constructive, destructive, or both? Why?

  21. Deposition • Deposition is constructive because it builds up Earth’s surface

  22. DEPOSITION NONLIVING CAUSES • ICE • Glaciers deposit sediments as they begin to melt (recede)

  23. DEPOSITION EFFECTS ICE -moraines -lakes -hills

  24. WIND When the wind slows down, the sediments are deposited The heaviest sediments are dropped first FORCES OFEROSION & DEPOSITION

  25. Deposition Effects • Wind • Sand dunes

  26. DEPOSITION NONLIVING CAUSES • WATER • -When the water slows down, the heaviest sediments are deposited first Older rivers have curves called meanders.

  27. Canarvon Gascoyne Delta Shark Bay W Australia

  28. WATER DEPOSITION EFFECTS sandbar delta beach

  29. DEPOSITION EFFECTS FLOODPLAINS

  30. DEPOSITION EFFECTS WATER stalagmites, & stalactites (ground) (ceiling)

  31. Constructive and Destructive Forces Review • Destructive • Forces that tear down/wear away Earth’s surface • Examples: • Weathering • Erosion • Constructive • Forces that build up Earth’s surface • Example: • Deposition

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