1. Shaping Our Planet EQ: Why does our planet look this way?

2. The Water Cycle

3. The Rock Cycle

5. Weathering and Erosion

6. Weathering
The breakdown of the materials on Earth’s surface into smaller pieces.

7. Physical Weathering
Process by which rocks are broken down into smaller pieces by external forces.
Types of Physical weathering
Frost heaving and Frost wedging
Plant roots
Friction and impact
Burrowing of animals

8. Frost Wedging

9. Frost Heaving

10. Plant Roots

11. Friction and Repeated Impact

12. Burrowing of Animals

13. Chemical Weathering
The process that breaks down rock through chemical changes.
The agents of chemical weathering
Water
Oxygen
Carbon dioxide
Living organisms
Acid rain

14. Water
Water weathers rock by dissolving it

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

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

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

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

20. Ice Erosion
Glaciers

21. Wind Erosion
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22. Mass Movements
Landslides, mudslides, slump and creep
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