| A | B |
| Drought | when the land is very dry because of a lack of precipitation |
| Flood | the act, condition, or effect of too much precipitation |
| Weathering | the wearing down of rocks over time by weather, water, and living things (producing soil) |
| Erosion | the carrying away of soil caused by wind and water |
| Conservation | the saving, preservation, and/or protection of natural resources |
| Pollution | anything harmful added to the air, water, or land |
| Interdependency | every living thing depends on other living things to survive |
| Resource renewal | a conservation practice in which species are protected; example: protecting endangered plants by saving their seeds |
| Species | a group of organisms that can mate and produce offspring |
| Endangered | the term used to describe a plant or animal species that is in danger of completely dying out (becoming extinct) |