Earth

What is the hard, dark substance found in the ground that is mined for fuel?

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What arc is created by refraction and light?
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How cold does it need to be outside before it can snow?
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Which of the following items is a tool used to tell time by the sun's movement in the sky?
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In the United States, summer officially begins in which month?
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Which of these terms can be used to describe steam?
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What is the mountain range that separates Spain from France?
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What is hail made of?
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What kind of gas is central in terms of the effect global warming?
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