1. Chapter 4
Lesson 3

2. Weathering and Erosion

3. Weathering
The process through which rocks or other materials are broken down..

4. Types of Weathering
Physical – caused by pushing, pulling, rubbing or temperature changes.
Chemical – caused by chemicals breaking down rocks
Often caused by acid rain
Or by certain chemicals in ground water

5. Frost Wedging

7. Erosion
The process by which rock is moved from one place to another.

8. Running water and waves
Ways Rocks Can Erode
Running water and waves
Wind
Ice (Glacial)
Gravity

9. Water
Water weathers rock by dissolving it

10. Water Erosion
Rivers, streams, and runoffs

11. Mudslides & Landslides
Mudslide – movement of a large amount of wet soil and rocks down a slope
Happens after lots of rain
Landslide – movement of a large amount of dry rock and soil down a slope
May occur after volcanic eruptions and earthquakes

12. Landslides

13. Mudslides

14. Glaciers - a large mass of slowly flowing ice

15. Cirque – steep hollow shape bowl in a mountain formed by a glacier.

16. Deposition – process by which eroded materials are dropped off in another place

18. Meanders – gentle loops in rivers
Sediment – particles of soil and rock that are carried along in water

19. Nile Delta

20. Headland – an area of land that has water on 3 sides.
Sandbar – sand that has been deposited over time so long that it makes a strip of sandy land.

21. Flood – when water collects on land that is normally dry
Floodplain – place that is easily flooded when river water rises

22. Wind Erosion

23. Protecting Shorelines
Breakwater – a long wall built out in the ocean parallel to the shore
Fences and Dunes – help keep sand dunes from being eroded by the wind