Earth

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

More Questions from Earth
What are the features on the surface of the Earth called?
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Which is heavier, cold air or warm air?
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What season has the warmest weather in the U.S.?
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In the United States, summer officially begins in which month?
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What kind of waves does an earthquake produce?
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What does granite become when put under heat and pressure?
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What word is generally used to describe visible air pollution?
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A clear sky contains very few what?
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