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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