1. 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

2. 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

3. 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

4. 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