Earth

What rock was used for navigation by the ancient Chinese people?

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Which star is the closest one to Earth?
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What was the most common type of rock to be found during the Precambrian Period?
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A vine disease caused by a fungus that attacks the green part of the vine is called?
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What is a comparison of air water vapor to amounts of vapor at a given temperature called?
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What does the Saffir-Simpson scale measure?
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What is the weather phenomenon known as a "tsunami"?
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What direction does a compass needle point to?
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