| A | B |
|---|
| natural resource | something found in nature that is used |
| raw material | resource that is changed before it is used |
| recyclable resource | is used over and over without destroying |
| renewable resource | is destroyed but can be replaced |
| nonrenewable resource | cannot be replaced once used |
| parent material | rock from which nature makes soil |
| mechanical weathering | nature physically breaks up rock |
| chemical weathering | dissolves rock material |
| humus | decayed pland and animal material that makes soil fertile |
| leaching | excesive rainfall drains soil of its nutrients |
| biotic resources | resources from living things |
| fossil fuels | oil, coal, natural gas |
| salt | nonmetallic mineral important to human health |
| adaptation | how plants and animals adjust to their environment |
| types of coal | peat, lignite, bituminous, anthracite |
| TVA | Tennessee Valley Authority - produces energy for large parts of the south |
| strip mining | removes topsoil to get at coal near surface |
| alternative energy resources | wind, water, solar, geothermal, tides, etc. |
| ore | rock which contains metal |
| fresh water | only makes up about 3% of total water supply |
