| A | B |
|---|
| Natural Resource | Anything in the environment that is used by people |
| Renewable Resource | Resources that are always available |
| Nonrenewable Resource | Resources that are not replaced in a usable time |
| Pollution | Contamination of Earth's land, water or air |
| Environmental Science | The study of natural processes in the environment and how humans can affect them |
| Clear-Cutting | The process of cutting down all the trees in an area at once |
| Selective Cutting | Cutting down only some trees in a forest and leaving a mix of tree sizes and species behind |
| Sustainable Yield | amount of a renewable resource such as trees that can be harvested regularly without reducing future supply |
| Fishery | an area with a lot of ocean organisms |
| Aquaculture | Raising fish and other water dwelling organisms for food |
| Biodiversity | The number of different species in an area |
| Keystone Species | A species that influences the survival of many other species in an ecosystem |
| Gene | the structures in an organisms cells that carry its hereditary information |
| Extinction | The dissapearance of a species from Earth |
| Endangered Species | Species in danger of becoming extinct in the near future |
| Threatened Species | Species that could become endangered in the near future |
| Habitat Destruction | the loss of a natrural habitat |
| Poaching | illegal killing of wildlife from their habitats |
| Captive Breeding | the mating of animals in zoos or wildlife preserves |
