the energy source in which a dam plays a key role is
the water for geothermal plants is heated by
electrical energy produced by the movement of air over the earths surface
electrical energy produced by the flow of water
plant material and other organic matter used as an energy source
energy produced by heat within the earth
the process of using materials more than once
the preservation and wise use of natural resources
the process of returning mined land to its original condition
Coal deposits are formed by
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