| A | B |
|---|
| Renewable resource | A resource that can be replenished over a relatively short time period |
| Nonrenewable resource | A resource that takes millions of years to form and accumulate |
| Fossil fuel | Any hydrocarbon that may be used as a source of energy - includes coal, oil, and natural gas |
| Ore | A useful metallic mineral that can be mined at a profit |
| Hydroelectric power | Power that is generated by falling water |
| Geothermal energy | Energy stored in natural underground reservoirs of steam and hot water |
| Point source pollution | Pollution that comes from a known and specific location |
| Nonpoint source pollution | Pollution that does not have a specific point of origin |
| Runoff | Water that flows over the land rather than seeping into the ground |
| Global warming | The unnatural warming of EarthÕs lower atmosphere caused by the increase of carbon dioxide in the atomosphere |
| Conservation | The careful use of resources |
| Compost | Partly decomposed organic material that is used as fertilizer |
| Recycling | The collecting and processing of used items so they can be made into new products |
