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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

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