| Term | Definition |
|---|
| soil | one of the Earth's most valuable resources, covers most of Earth's surface, plants grow in it, animals live in it |
| weathering | the breaking down of large rocks into small particles by wind, water, or chemicals |
| bedrock | a solid layer of rock below the soil, weathered to make upper layers of soil |
| topsoil | above subsoil, contains most nutrients, moisture, and humus |
| humus | dark, organic material made up of decomposing plants and animals |
| permeability | the ability of a soil to pass water and air |
| clay | has the smallest size of soil particles |
| silt | has soil particles slightly larger than clay |
| loam | a mixture of all soil types |
| sand | has the largest size of soil particles |
| erosion | the picking up and moving of soil particles by wind or water |
| basins | low-lying areas that collect water ex. rivers |
| surface water | the water that collects above ground |
| ground water | water found under the surface |
| reservoir | when surface water is stored for human use |
| aquifer | an underground cave that traps and holds water |
| watershed | an area of land that supplies fresh water to a basin |
Combine with other sets
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