Physical Weathering

5. What is one thing that can undergo weathering below the surface but is more likely to above the surface?
7. What is the process by which outer layers of rock slowly peel away due to pressure changes?
9. What occurs when wind lifts and carries small particles into the air?
12. Even temperature increases and decreases during ______ and ______ can affect rocks.
14. What is one factor that contributes to physical wheathering?
15. What is one material that breaks down during weathering?

1. When rocks break apart, they become more exposed to what?
2. As _____ materials are removed above the rock, pressure decreases.
3. If this changes, rocks can split; if this increases, rocks can expand but if decreased, rocks can contract.
4. In moving what can rock become smooth and round?
6. During a what can large rocks fall from high above breaking more rocks below?
8. Who/What digs causing rock to be exposed?
10. What is known to also be called frost wedging?
11. What is one animal that contributes to physical weathering?
13. What is the name of rock being broken down and wearing away that is caused by the mechanical action of other rocks?