| A | B |
|---|
| Hydroelectric energy | Electricity produced by moving water. |
| Nonrenewable resource | An energy source that exists in a fixed amount or that is used up faster than it can be |
| Recycling | The process of recovering materials that ordinarily would be thrown away. |
| Nuclear Fission | The process of splitting the nucleus of a radioactive atom, forming lighter elements and |
| Fossil fuels | A nonrenewable energy source formed from ancient plants and animals that were buried in |
| natural resource | Any energy source, organism, or substance found in nature that people use. |
| hydrogen fuel cell | A device that produces electricity by combining hydrogen and oxygen. |
| conservation | The process of protecting, restoring, and managing natural resources so they last as long |
| renewable resource | An energy source that can be replaced in nature at about the same rate it is used. |
| solar cell | A specially constructed sandwich of silicon and other materials that uses sunlight as an |
| geothermal energy | Energy produced by heat within Earth’s crust |
| biomass | Organic matter that can be used as fuel |
| recycling | shredded plastic to fill a ski jacket; Sunday newspapers saving 500,000 trees; energy from |
| fossil fuel | oil; natural gas; coal |
| biomass | plant and animal waste used as fuel; can release as much carbon dioxide as burning fossil |
| solar cell | sunlight causes electrons to move and produce electric current; can power small appliances; |
| conservation | turning off water; using only the napkins you need; refilling soft drink bottles; |
| natural resource | coal; wind; oil; water; forests |
| nuclear fission | energy released from one atom is 20 million times greater than the energy released by one |
| hydrogen fuel cell | combines hydrogen and oxygen to produce electricity; efficient; byproducts are heat and |
