Earth

Which of the following minerals is the hardest?

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In a "drought", what is absent in terms of weather?
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Which scale is used to describe a mineral's hardness?
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How many miles long is an average bolt of lightning?
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Which of these is the best way meteorologists track big storms such as hurricanes?
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Al Gore made a film about what climate issue?
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In the U.S., the spring equinox occurs in what month?
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When is Earth day every year?
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How long does it take the earth to rotate around its axis?
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