| A | B |
| Renewable Resource | resource that can be replaced at a rate that is greater than the rate in which they are being used |
| Nonrenewable Resource | resources that are being used at a rate that is faster than they can be replaced |
| Wind, solar power, hydroelectircity | examples of renewable resources |
| coal, oil, and natural gas | examples of nonrenewable resources |
| coal | formed from plants that died millions of years ago |
| oil & natrual gas | formed from marine organisms that died millions of years ago |
| Reduce, Reuse, Recycle | ways to conserve our natural resources |
| landslide | large areas of ground movement of rock caused by rain, flood, earthquake or mhumans |
| wildfires | a natural event that can cause some types of seeds to break open and germinate |
| floods | water overflowing onto normally dry land and sometimes redeposits sediment in other places. |
| Immigration | populations entering an environment |
| Emmigration | populations leaving an environment |