Earth

Which is heavier, cold air or warm air?

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Which of the following is magnetic?
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What are ridges of rock debris caused by glacial action called?
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Which of these is the Greek name for the east wind?
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How are pockets of air in soil made?
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Which of the world's oceans is larger than all of the Earth's land area combined?
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Which of these is another name for dirt?
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Which is another name for a pudding stone?
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A scientist that studies the Earth's surface is called what?
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