Earth

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

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In a "drought", what is absent in terms of weather?
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What were water mills used for in the 1700's in Europe?
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In what month does a "Milk Moon" occur?
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Which of these is the first step in the making of a fossil?
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What is petroleum as found in the earth, before it is refined?
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What is another name for an estuary?
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Which country produces about 1/5 of the world's garbage per year?
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A weather proverb says "A year of snow," followed by what?
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