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ch 20-21 LS HRW
ch 20-21 LS HRW
20
Biology
7th Grade
04/12/2012

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Term
biodiversity
Definition
the number and variety of organisms in a given area during a specific period of time
Term
biome
Definition
a large region characterized by a specific type of climate and certain types of plant and animal communities
Term
conservation
Definition
the preservation and wise use of natural resources
Term
deep-water zone
Definition
the zone of a lake or pond below the open-water zone, where no light reaches
Term
desert
Definition
a region that has little or no plant life, long periods without rain, and extreme temperatures; usually found in hot climates
Term
estuary
Definition
an area where fresh water from rivers mixes with salt water from the ocean
Term
littoral zone
Definition
the shallow zone of a lake or pond where light reaches the bottom and nurtures plants
Term
marsh
Definition
a treeless wetland ecosystem where plants such as grasses grow
Term
nonrenewable resource
Definition
a resource that forms at a rate that is much slower than the rate at which it is consumed
Term
open-water zone
Definition
the zone of a pond or lake that extends from the littoral zone and that is only as deep as light can reach
Term
overpopulation
Definition
the presence of too many individuals in an area for the available resources
Term
plankton
Definition
the mass of mostly microscopic organisms that float or drift freely in freshwater and marine environments
Term
pollution
Definition
an unwanted change in the environment caused by substances or forms of energy
Term
recycling
Definition
the process of recovering valuable or useful materials from waste or scrap
Term
renewable resource
Definition
a natural resource that can be replaced at the same rate at which the resource is consumed
Term
savanna
Definition
a grassland that often has scattered trees and that is found in tropical and subtropical areas where seasonal rains, fires, and drought happen
Term
swamp
Definition
a wetland ecosystem in which shrubs and trees grow
Term
tundra
Definition
a treeless plain found in the Arctic, in the Antarctic, or on the tops of mountains that is characterized by very low winter temperatures and short, cool summers
Term
wetland
Definition
an area of land that is periodically underwater or whose soil contains a great deal of moisture
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