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