Earth

Which is heavier, cold air or warm air?

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What is in the sky if it is overcast?
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What is the hardest mineral known on Earth called?
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Which rock would test positive to an acid test?
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What is petroleum as found in the earth, before it is refined?
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John Glenn first orbited the earth in what year?
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Which of these bodies of water would it be easiest to float and swim in?
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What do we call the dependable winds that rush toward the equator from the north and south?
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How much salt is in every gallon of seawater?
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