Weathering

4. deposits that form upward from the ground in caves
6. small pieces of broken rock
7. how caves form
9. created by weathering of rocks; contains humus, nutrients and broken rocks
11. when water, oxygen and iron react to for rust
12. type of chemical weathering that uses water to dissolve minerals in the rock
14. repeated freezing and thawing of water creating cracks in the rock
15. coal, oil, and natural gas are examples of this non-renewable resource
17. water cannot seep through the solid rock
22. this type of weathering changes the chemical composition of the rock
23. wearing away of rocks due to grinding against other rocks
25. what carbonic acid dissolves to form caves

1. deposits in caves that hang from the ceiling
2. forms from the exhaust from the burning of fossil fuels combining with water droplets
3. process that breaks down rocks on the surface of Earth
5. layers of the soil beneath the surface
7. what is created when we burn fossil fuels
8. abrasion by this causes small dents (pitting)
10. roots of these grow in cracks of the rock
13. nutrient rich layer in soil made from dead organisms
16. what minerals are made up of
18. type of weathering that breaks rocks into smaller pieces, without changing the composition
19. general term for the organisms that burrow in the ground causing physical weathering
20. what happens to water when it freezes
21. this speeds up chemical reactions
24. abrasion by this causes smoothing and rounding of rocks