| A | B |
|---|
| Natural resources | parts of the environment that are useful or necessary for the survival of living organisms |
| Nuclear power | produced when billions of uranium nuclei are split apart in a nuclear fission reaction |
| Recycling | reuse of a resource that requires changing or reprocessing the resource |
| Renewable | resources that are constantly recycled or replaced by nature |
| Hazardous wastes | waste materials that are very harmful to human health or poisonous to living organisms |
| Acid rain | mist |
| Greenhouse effect | heat-trapping feature of the atmosphere |
| petroleum | formed from the remains of marine organisms |
| fossil fuels | nonrenewable energy sources |
| nonrenewable | natural resources that are used up more quickly than they can be replaced |
| geothermal energy | heat energy contained in Earth's crust |
| erosion | movement of soil by wind and water |
| ozone depletion | thinning of Earth's protective ozone layer |
| pollutant | substance that contaminates the environment |
