1. Erosion: Shaping the Landscape

2. What do you think happened to this rock?
Pre-assessment
Hmmm....
What do you think happened to this rock?

3. Learning Objectives Objectives Know what erosion is
Name the forces of erosion
Describe the action of erosion
Categorize types of erosion

4. What is Erosion? Definition Main Entry ero·sion Some agents of
i -'rO - zh&n
Function: noun
1.The wearing away
and carrying off of
rock, soil, sand, or
other, earth materials.
Some agents of
erosion include:
Water
Wind
Gravity
Weathering
Human Activity

5. Water Water the most power agent of Erosion !!
Water can come in many forms.
Rain Drops, Storm-swollen rivers, Ocean waves, Rushing Streams, Glaciers (compressed snow)

6. Wind
Wind
Wind is most important in areas where there is little rain and very little or no vegetation. (Beach, Desert, Prarie)
Wind erosion can be dangerous. In 1937 there were giant dust storms.

7. Gravity
The pull of gravity causes the downward movement of materials.
This motion can be very slow. For example soil
being pulled down a hillside. The motion can also be very fast like a mudslide.
Gravity

8. Weathering Weathering
Weathering is the breaking down of rocks or the Earth’s surfaces through chemical or mechanical processes.
- Heating and cooling
- Plant Roots
- Pockets of Freezing Water
- Chemicals (Pollution, Acid Rain)

9. Human Activity Human Activity Industrial development
- Factories
- Automobiles
Poor agricultural (Farming) habits
- Polluted Runoff
- Removing of vegetation
Deforestation
-Cutting down of tress

10. No! The End? IS THIS THE END OF THE WORLD?!?
The process of erosion both wears away and builds a new.
Nature is a balanced system. Even though mountains are
destroyed by erosion molten rock within the Earth rises
and creates new mountains.
Erosion might rob one area of soil but it is simply moving it
to another location.
When a river floods it leaves mineral deposits that help
plants grow.
When rocks are broken down they form sand and soil.
No!

11. Explore How wind Shapes the Landscape
Activity
Activity
Explore How wind Shapes the Landscape
What happens when you blow the rice around in the pan?
Where might this type of erosion be found?
How does wind effect …
-Deserts?
-Mountain tops?
-Beaches?
-Sand dunes?

12. Closure
Sum it up !!
Erosion is the wearing away and carrying off of rock, soil, sand, or other, earth materials.
The Forces of erosion are…
Water, Wind, Gravity, Weathering, Human Activity
The procession of erosion both wears away and builds the environment.
Verdict…
More than likely the rock split because of heating and cooling.