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renewable resources

resources that nature can produce again and again in a relatively short period of time such as lumber

nonrenewable resources

resources that nature can not replace quickly enough to meet people's needs such as fossil fuels

inexhaustible resources

resources that are never used up as they are being used such as sunlight, wind, or waves

surface water

any water on the ground that meets the atmosphere

ground water

water found below the surface of land; a source of drinking water


an underground permeable rock layer through which water flows freely


the total land area from which water drains into a stream, river, or lake

climate changes

long-term alteration in global weather patterns, including increases in temperature and storm activity


a period of time during which one complete sequence of a recurring series of events occurs


the process by which water, ice, wind, heat, animals, and plants act to break up rock

rock cycle

the continuous process in which new rock is formed from old rock


a change in form


a large grouping of stars and planets in space

light year

the distance that light travels in one year; used to measure vast distances (1 light year=just under one trillion kilometers)

lunar cycle

the continuous waxing and waning phases of the moon


the struggle between organisms for limited resources such as food or light (ex: between weeds and flowers for the same nutrient supply)


features or qualities that distinguish something


an essential identifying nature or character of something


to make small changes to something


a result, or the way that something turns out in the end

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