the short term changes in the air for a given place of time
a regions average weather conditions over a long period of time
winds that blow in the same direction over earth
large streams of surface water
the place where two air masses of different temperatures or moisture content meet
an area of tall grasses and scattered trees and shrubs
a seasonal wind that brings either dry or moist air
a semidry grassland or prairie
permanently frozen layer of soil
the land, water, climate, plants, and the animals of the area; surroundings
a group of plants and animals that depend on each other for survival, and the environment in which they live
the place where plants and animals live
to die out; no longer alive
decayed plant and animals; it helps soil support abundant plant life
the spread of desertlike conditions
any material in nature that people use and value
a resource that earth replaces naturally
a resource that cannot be replaced naturally
the clearing of trees
planting trees to replace lost forestland
nonrenewable resources that formed from remains of ancient plants and animals
the production of electricity from water power such as running water
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