1. Erosion & Deposition

2. DEFINITIONS Erosion - Brainstorm: 1) What is it? 2) What can cause it?
3) How does erosion change the surface of the Earth? -
Possible Types:
Have students discuss these questions as a class. Then have the students choose an appropriate definition to write. (Guide them to correct definition). The write down some of the possible causes that the students think cause weathering.

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

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

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

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

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

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

10. EROSION EFFECTS

11. 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

12. 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.

13. WATER EROSION EFFECTS
caves

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

15. 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
sinkholes

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

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

18. 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

19. GRAVITY EROSION EFFECTS
Mass Movement
Mudflows
Landslides

20. DEFINITIONS Deposition - Brainstorm: 1) What is it?
2) How can deposition change the surface of the Earth? -
Have students discuss these questions as a class. Then have the students choose an appropriate definition to write. (Guide them to correct definition). The write down some of the possible causes that the students think cause weathering.

21. 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?

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

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

24. DEPOSITION EFFECTS
ICE
-moraines
-lakes
-hills

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

26. Deposition Effects
Wind
Sand dunes

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

28. Canarvon Gascoyne Delta Shark Bay W Australia

29. DEPOSITION EFFECTS
WATER
sandbar
delta
beach

30. DEPOSITION EFFECTS
FLOODPLAINS

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

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