Earth

Which of these types of energy is cleanest and causes the least pollution?

More Questions from Earth
What is another name for continental glaciers?
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What mountains separate Europe from Asia?
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What organic material is formed from decaying organisms that mix with rocks?
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What are solids contained in the gas that issues from a volcano called?
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What is the boundary between two air masses called?
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What process helps to break down rocks by wind, air or rain?
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What is the opening that spews out lava called?
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What kind of scientist would study rocks, minerals and mountains?
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