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22 terms

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