weathering and erosion

4. water from precipitation that flows over the land
5. the path that a stream follows
6. a flat area along a river formed by sediments deposited when a river overflows
10. the wearing down of rock surfaces by other rocks or sand particles
11. the mechanical weathering process in which water in the cracks of rocks freezes and expands, widening the cracks
13. the breaking down of rocks by chemical processes
14. a loose layer of rock and soil
16. a mushroom-shaped rock formed by the erosion of the rock's base
18. the downhill movement of rocks and soil caused by gravity
20. unsorted rocks and sediments left behind when a glacier melts
22. a narrow ditch cut in the earth by runoff
24. a chemical change in which a substance combines with oxygen
25. the breaking down of a substance by a chemical reaction with water
26. a piece of till that is not native to the place where it was deposited

1. the rapid downhill movement of a large mass of mud and debris
2. an accumulated deposit of till
3. the breaking down of rocks by physical processes
7. the general term for any sediment deposited by a glacier
8. a soil depression scooped out by the wind
9. the process in which carbon dioxide from the atmosphere or soil dissolves in water to form carbonic acid
12. the movement of wet soil down a slop
15. a large mass of moving ice that forms on land and remains from year to year
17. a long, tear-shaped mound of till
19. the surface features of a place or region
21. the extremely slow downhill slide of soil
23. the rapid downhill movement of a large amount of rock and soil