| A | B |
|---|
| mechanical weathering | weathering done by wind or water |
| chemical weathering | weathering done by acid rain |
| erosion | breaking down of rock or soil surfaces |
| deposition | process by which eroded material is moved from place to place |
| root pry | water freezes in cracks in rocks where plants grow, and their roots are forced up |
| soil horizon | layer within a soil profile |
| soil profile | different layers of rock that comprise soil |
| humus | rich layer below topsoil that contains decayed plants and animal remains |
| parent rock | rock at the bottom of the soil profile from which all other soil forms |
| topsoil | layer in which plant roots are located |
| weathered parent rock | lies just above parent rock and is actually eroded material |
| subsoil | layer underneath topsoil |
| young river | river banks that are narrow; water runs at a fast rate |
| mature river | river with wider banks due to erosion over time; water runs more slowly |
| turbidity | measurement of amount of dissolved solids in water that are caused by erosion and runoff near river banks |
| five agents of erosion | wind, water, gravity, glaciers, waves |
| loess | deposits formed from wind on sand dunes |
| moraine | build -up of rock and debris; final hill formed by a glacier |
| till | rocks and debris pushed ahead as the glacier moves |
| mass wasting | erosion that happens quickly and moves a lot of earth materials |
