1. Weathering and Erosion

2. Weathering
The breakdown of Earth’s crust into smaller pieces.

3. Mechanical (Physical) Weathering
Process by which rocks are broken down into smaller pieces by external conditions.
Types of Mechanical weathering
Frost heaving and Frost wedging
Plant roots
Impact of wind and water
Abrasion
Burrowing of animals
Temperature changes

4. Frost Wedging

5. Frost Heaving

6. Plant Roots

7. Friction and Repeated Impact

8. Burrowing of Animals

9. Temperature Changes

10. Chemical Weathering
The process that breaks down rock through chemical changes.
The agents of chemical weathering
Water
Oxygen
Living organisms
Acid Rain
Carbon Dioxide

11. Water
Water weathers rock by dissolving it

12. Oxygen
Iron combines with oxygen in the presence of water in a processes called oxidation
The product of oxidation is rust

13. Living Organisms
Lichens that grow on rocks produce weak acids that chemically weather rock

14. Acid Rain
Compounds from burning coal, oil and gas react chemically with water forming acids.
Acid rain causes very rapid chemical weathering

15. Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid
Carbonic acid easily weathers limestone and marble

16. Karst Topography Karst is created by chemical weathering of limestone
A type of landscape in rainy regions where there is limestone near the surface, characterized by caves, sinkholes, and disappearing streams.

17. Features of Karst: Sinkholes

18. Features of Karst: Caves

19. Features of Karst: Disappearing Streams

21. Erosion
The process by which water, ice, wind or gravity moves fragments of rock and soil.

22. Water Erosion
Rivers, streams, and runoff

23. Ice Erosion
Glaciers

24. Wind Erosion

25. Mass Movements Landslides, mudslides, slump and creep
landslide clip.mpeg

27. What have you learned? What is erosion?
2. How are weathering and erosion connected?
Give 2 examples of weathering. 3. 4.
Give 2 examples of erosion. 5. 6.