coal - a hard, black substance that is dug from the earth in pieces, and can be burned to produce heat or power, or a single piece of this, nuclear power - the power produced when the nucleus (= central part) of an atom is divided or joined to another nucleus, to split - to divide into two or more parts, fossil fuel - fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago, to contaminate - to make something less pure or make it poisonous, solid - hard and firm, steam - the hot gas that is produced when water boils, biofuel - a fuel that is made from living things or their waste, solar power - energy that uses the power of the sun to produce electricity, hydroelectric - producing electricity by the force of fast moving water , renewable - can be produced as quickly as they are used, concrete - a very hard building material made by mixing together cement, sand, small stones, and water,
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Unit 7А Words controlled practice
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