Earth

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

More Questions from Earth
Which of these terms can be used to describe steam?
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How many continents does Earth have?
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What is the only continent on Earth that does not have snakes?
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What is the hard, dark substance found in the ground that is mined for fuel?
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What is the term for when pieces of glaciers break off and form icebergs?
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Ruby and sapphire are gem forms of which mineral?
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Which of these is a way to curb human pollution?
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Earth's crust is made of many pieces called ______ plates.
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