1. Warm-up: 11/13/12
Weathering is the physical breakdown of rocks. Can you guess what types of weathering happened here? #1 #2

2. WEATHERING NOTES

3. Mechanical Weathering
The physical breakdown of rocks

4. TYPES OF MECHANICAL WEATHERING

5. Freezing and Thawing
Water in rock’s crack freezes, expands, and breaks the rock apart

6. Abrasion (Wind or Water)
Rocks and Sand rubbing on each other via wind and/or water

7. Animal Action
Various animal behaviors breakdown rocks

8. Plant Growth
Plant’s roots burrow into cracks, grow, and break rocks apart

9. Release of Pressure
Outer layers of rock are removed, releasing pressure and causing cracking on the rock

10. Chemical Weathering The breakdown of rocks through chemical changes
Caused by water, carbon dioxide, oxygen, living organisms, and acid rain

11. EXAMPLES OF CHEMICAL WEATHERING

12. Parts of rocks dissolve in water

13. Water and oxygen cause some rocks to rust and crumble (oxidation)

14. Carbon dioxide and acid rain can dissolve soft rocks