| A | B |
|---|
| compost | partly decomposed organic material that is used as fertilizer |
| conservation | the careful use of resources |
| fossil fuel | general term for any hydrocarbon that may be used as a fuel, including coal, oil, and natural gas |
| geothermal energy | energy that can be extracted from Earth’s internal heat, for example, natural steam used for power generation |
| global warming | the increase in average temperatures of Earth and the atmosphere due in part to increased carbon dioxide levels |
| hydroelectric power | the power generated by falling water |
| nonpoint source pollution | water pollution that does not have a specific point of origin |
| nonrenewable resource | resource that takes millions of years to form |
| ore | a material from which a useful mineral or minerals can be mined at a profit |
| point source pollution | water pollution that comes from a known and specific location |
| recycling | the collecting and processing of used items so they can be made into new products |
| renewable resource | a resource that is virtually inexhaustible or that can be replenished over relatively short time spans |
| runoff | water that flows over the land surface rather than seeping into the ground |
