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Chapter 19 Vocab
mostly about ecosystems
16
Science
7th Grade
04/04/2010

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Term
renewable resources
Definition
resources that are replaced in a relatively short time
Term
inexhaustible resources
Definition
resources that the supply is almost limitless
Term
nonrenewable resources
Definition
natural resources that are replaced as they are used
Term
pollution
Definition
any change to the environment that has a negative effect on living things
Term
biodiversity
Definition
the number of species in an area
Term
keystone species
Definition
a species that influences the survival of many other species in an ecosystem
Term
extinction
Definition
the disappearance of all members of a species from Earth
Term
endangered species
Definition
species in danger of becoming extinct in the near future
Term
threatened species
Definition
species that could become endangered in the near future
Term
clear-cutting
Definition
the process of cutting down all the trees in an area at once
Term
selective cutting
Definition
cutting down only some trees in a forest and leaving a mix of tree sizes and species behind
Term
sustainable yield
Definition
a regular amount of a renewable resource such as tres that can be harvested without reducing the future supply
Term
fishery
Definition
an area with a large population of valuable ocean organisms
Term
aquaculture
Definition
the practice of raising fish and other water-dwelling organisms for food
Term
gene
Definition
structure in an organisms's cells that carries its hereditary information
Term
poaching
Definition
hunting wildlife illegally
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