1. Erosion and Landforms

2. Erosion and Landforms
Key Question: What is erosion and what are the types of erosion?
Initial Thoughts:

3. Evidence Glue the student notes handout into your journal.
Take notes from the PowerPoint Presentation.

4. Evidence What is Erosion?
The process by which weathered rock and soil particles are moved from place to place.
What is Deposition?
The process by which weathered sediments are laid down in a new location creating new landforms.

5. 5 Agents of Erosion There are five agents of erosion. Gravity Glaciers
Wind
Surface Water / Running Water
Ocean Shoreline / Ocean Waves

6. Gravity Pulls rock and soil down a slope Called Mass Movement Rapid
Rockslides
Mudflow
Avalanche

8. Gravity
Slow
Slump
Creep

9. Glaciers Carry very large to very small debris Most powerful agent
What do they deposit?
Form piles called moraines
Drumlins – little mounds
Glacial lakes
Kettle lakes
U-shaped valleys

10. Moraines

11. Drumlins
Glacial lakes

12. Kettle Lakes
U-shaped valleys

13. Glaciers

14. Wind Removes loose material from the earth’s surface.
Amount of material carried depends on wind speed
Most active in deserts,
plowed fields, beaches
What does wind deposit?
Loess- layer of fine silt or sand
Dunes- mounds of sand

15. Loess

16. Dunes

17. Running Water MAJOR CAUSE OF EROSION
When water moves it carries particle called the load.
Speed of water determines the size of the load
Creates canyons and valleys
What do rivers create/deposit?
Deltas
Oxbow lakes
Flood plains

18. River Deltas

19. Oxbow Lakes

20. Flood Plains

21. Waves Constantly erode and shape the shoreline.
What formations do waves
create?
Sea cliffs
Sea stacks and caves

22. Sea Stacks

23. Sea Stacks & Cliffs

24. Cape Flattery, Olympic Peninsula
Sea Caves

25. Waves
What do waves deposit?
Beaches
Spits
Sand bars
Barrier Islands

27. Barrier Islands

28. Spits & Sandbars

29. Coral Islands
Lava from an underwater volcano builds up an island. Living organisms begin living around the shores of the island (polyps).
Volcano becomes inactive, sinks, coral dies, an island forms.
The formation is a hard rock-like material formed by the skeleton of marine polyps and sand (takes millions of years!)

30. Coral Islands
Usually forms a ring and partially or totally encloses a shallow body of water, or lagoon
Most are found in the Pacific Ocean

31. Limestone Deposits Form underwater from the shells of dead animals
Takes millions of years!

32. Limestone Deposits

33. Oil/Coal Deposits
Plant matter accumulates at the bottom of a body of water (must be protected by from decomposition and oxygen exposure—usually gets covered by mud or an acidic water layer). Over millions of years, it forms into a hardened brownish black sedimentary rock.

34. Oil/Coal Deposits
Coal is a fossil fuel and is the largest source of energy and the largest source of carbon dioxide emissions
Coal is extracted from the ground by mining, either underground or in open pits.

35. Oil/Coal Deposits
Oil is generally formed from marine deposits and coal is generally formed from land vegetation.

37. Sources

38. Analysis List the causes of erosion.
Compare some major differences between the types of erosion.

39. Summary What did you think about erosion before this lesson?
What did you learn about erosion from this lesson? (Minimum of 3 sentences!!!)
What are some further thoughts or questions you have about erosion?

40. Reflection What is the difference between erosion and weathering?
What types of landforms are created by erosion?

41. Big Idea