Earth

Which is heavier, cold air or warm air?

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What rock was used for navigation by the ancient Chinese people?
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What theory proposes that Earth's landmasses were once connected and drifted apart?
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How long does it take the earth to rotate around its axis?
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What word means "the shakes that come after the earthquakes"?
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Where does hail form?
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From which does the Global Positioning System receive its information?
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What ongoing process allows water to be constantly recycled?
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What is the solid form of water?
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