Natural Resource Renewable Resource Pollution Nonrenewable Resource Anything in the environment that is used by people Renewable Resource A resource that is either always available or is naturally replaced in a relatively short time. Nonrenewable Resource A resource that is not replaced in a useful time frame Pollution Contamination of the Earth’s land, water or air Environmental Science The study of the natural processes that occur in the environment and how humans can affect them

Clear Cutting Selective Cutting Sustainable Yield Fishery Aquaculture The process of cutting down all the trees in one area all at once Selective Cutting The process of cutting down only some of the trees in an area Sustainable Yield The amount of a renewable resource that can be harvested regularly without reducing the future supply Fishery An area with a large population of valuable ocean organisms Aquaculture The practice of raising fish and other water dwelling organism for food

Biodiversity Keystone Species Extinction Endangered Species The number of different species in an area Keystone Species A species that influences the survival of many others in an ecosystem Extinction The disappearance of all members of a species from Earth Endangered Species A species in danger of becoming extinct in the near future Threatened Species A species that could become endangered in the near future

Habitat Destruction Poaching Captive Breeding Habitat Fragmentation The loss of a natural habitat Habitat Fragmentation The breaking of a habitat into smaller isolated pieces Poaching Illegal killing or removal of wildlife from their habitats Captive Breeding The mating of animals in zoos or wildlife preserves