Physical Weathering

1. During a what can large rocks fall from high above breaking more rocks below?
3. Even temperature increases and decreases during ______ and ______ can affect rocks.
4. When rocks break apart, they become more exposed to what?
9. What is one thing that can undergo weathering below the surface but is more likely to above the surface?
10. What is one animal that contributes to physical weathering?
13. As _____ materials are removed above the rock, pressure decreases.
14. What is one material that breaks down during weathering?
15. What is one factor that contributes to physical wheathering?

2. What is the process by which outer layers of rock slowly peel away due to pressure changes?
5. What is known to also be called frost wedging?
6. Who/What digs causing rock to be exposed?
7. What occurs when wind lifts and carries small particles into the air?
8. If this changes, rocks can split; if this increases, rocks can expand but if decreased, rocks can contract.
11. In moving what can rock become smooth and round?
12. What is the name of rock being broken down and wearing away that is caused by the mechanical action of other rocks?