1. Notebook Setup
On page 32, glue down the “Weathering and Erosion” worksheet
On page 33, glue down the “Landform Scavenger Hunt” worksheet

2. Warmup What makes something “good”?
What makes it different than something “bad”?

3. Weathering and Erosion

4. Weathering
The gradual breakdown of the materials of Earth’s crust into smaller pieces through chemical or mechanical processes.

5. Physical Weathering
Process by which rocks are broken down into smaller pieces by external conditions.
Types of physical weathering are:
Frost wedging and frost heaving
Plant roots
Friction and impact
Burrowing of animals
Temperature changes

6. Frost Wedging

7. Frost Heaving

8. Plant Roots

9. Friction and Repeated Impact
Breaks off pieces of rock, and gradually forms smooth round rocks found in stream beds or along lake shores.

10. Burrowing of Animals

11. Temperature Changes

12. Chemical Weathering
The process that breaks down rock through chemical changes.
The types of chemical weathering are:
Water
Oxygen
Carbon dioxide
Living organisms
Acid rain

13. Water
Water weathers rock by dissolving the minerals

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

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

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

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

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

19. Water Erosion Rivers, streams, and runoff
Delta-a fanlike deposit of sediment where a river enters an ocean/sea.

20. Ice Erosion
Glaciers-large long lasting mass of ice that moves due to gravity and plucks rocks and boulders and scourers valleys smooth.

21. Glaciers Creates U-Shaped valleys
Moraine-piles of rocks that form hills or ridges that are left behind/deposited once a glacier has melted or receded.
Kettles- small glacial depressions that fill with water to form small lakes

22. Wind Erosion
Winds must be 11 mph to move sediment. Dust storms can move 6,000 tons per cubic mile of air.
Loess: windblown silt and clay that produces very fertile soil (Mississippi, N. China, Argentina)

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

24. Activity
Using your atlases, draw a picture of the landform you are given and find an example in the world