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Earth's Surfaces
Unit 7
| Term | Definition |
|---|---|
| natural resources | Materials found in nature that are used yliving things to meet their needs |
| renewable resources | natural resources that can be replaced quickly |
| nonrenewable resources | natural resources than can not be replaced quickly |
| conservation | the preserving and protecting of a resource, often by using less |
| weathering | the breaking down of rocks on earth's surfaces into smaller pieces |
| erosion | the process of moving sediment from one place to another |
| deposition | the process of dropping bits of rock and soil |
| sediment | very small pieces of rock, sand, and silt |
| bedrock | solid rock found under soil |
| humus | The remains of decayed plants or animals (organic matieral) in soil |
| soil | A mixture of water, air, tiny pieces of rock and humus (organic material) |
| soil horizon | A layer of soil with differernt physical characteristics from the layer of soil above it and the layer of soil below it |
| soil profile | A vertical, cross-section of soil that shows the various layers of soil |
| water retention | The ability to "hold onto" water |
| loam | A soil with roughly equal parts clay, silt, and sand. |
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