Science

What is the hardest known natural material?

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What liquid is used as a standard when measuring density?
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How many watts is one horsepower?
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Which is not one of the three states of matter?
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The term, "black hole", was named by American physicist, John Wheeler, in which year?
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What is the term given to heat and light radiated from the sun?
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What is the full name for CFCs?
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What is a lever?
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Sudden, transient motion or trembling of the earth's crust best fits which science term?
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