Weathering

2. The breakdown of rocks by chemical reactions
4. roots cause rocks to break
6. Break down minerals
8. The process by which the outer layers of rock slowly peel away due to pressure changes
9. Breaking down and wearing away of rock material by the mechanical action of other rock
11. cause rocks to form
13. Form on cave celling
16. The breakdown of rock material by physical and chemical processes
18. carries small rocks across distances
19. form on cave floors

1. The process by which rock is broken down into smaller pieces by physical changes
3. makes rocks smooth
5. other chemicals mix with oxygen
6. dig burrows
7. Chemicals combine with water in the atmosphere to produce stronger acids
10. Cracks in rocks to expand as water seeps in and freezes
12. iron mixing with oxygen
14. cause rocks to expand and contract
15. Produces acids that brake down rocks
17. cause large rocks to fall and break