Physical Weathering

2. In moving what can rock become smooth and round?
3. What is known to also be called frost wedging?
5. What is one animal that contributes to physical weathering?
6. What is one material that breaks down during weathering?
7. As _____ materials are removed above the rock, pressure decreases.
9. When rocks break apart, they become more exposed to what?
12. During a what can large rocks fall from high above breaking more rocks below?
13. Who/What digs causing rock to be exposed?
14. Even temperature increases and decreases during ______ and ______ can affect rocks.

1. If this changes, rocks can split; if this increases, rocks can expand but if decreased, rocks can contract.
2. What occurs when wind lifts and carries small particles into the air?
4. What is the name of rock being broken down and wearing away that is caused by the mechanical action of other rocks?
8. What is one thing that can undergo weathering below the surface but is more likely to above the surface?
10. What is the process by which outer layers of rock slowly peel away due to pressure changes?
11. What is one factor that contributes to physical wheathering?