1. Erosion & Deposition

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

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

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

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

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

7. EROSION EFFECTS

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

9. 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.

10. WATER EROSION EFFECTS caves

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

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

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

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

15. 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

16. GRAVITY EROSION EFFECTS Mudflows Landslides Mass Movement

17. DEFINITIONS Deposition Brainstorm: 1) What is it? 2) How can deposition change the surface of the Earth? -

18. 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?

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

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

21. DEPOSITION EFFECTS ICE -moraines -lakes -hills

22. FORCES OF EROSION & DEPOSITION WIND When the wind slows down, the sediments are deposited –The heaviest sediments are dropped first

23. Deposition Effects Wind –Sand dunes

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

25. Canarvon Gascoyne Delta Shark Bay W Australia

26. DEPOSITION EFFECTS WATER delta sandbar beach

27. DEPOSITION EFFECTS FLOODPLAINS

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

29. 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

30. DEFINITIONS Erosion Brainstorm: 1) What is it? 2) What can cause it? 3) How does erosion change the surface of the Earth? - Possible Types:

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