| A | B |
| Weathering | breaking down and wearing away of rock |
| Inexhaustible Resources | resources that can never be used up |
| Nonrenewable Resources | resources that nature cannot replace quickly |
| Renewable Resources | resources that nature can produce again and again |
| Carnivores | organisms that only or mostly eat meat |
| Omnivores | organisms that eat both meat and plants |
| Herbivores | organism that only or mostly eats plants |
| Producers | organisms that make energy |
| Consumers | organisms that get their energy from eating producers |
| Decomposers | organisms that get their energy from breaking down dead plants or animals |