Earth

Which is heavier, cold air or warm air?

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What is the hard, dark substance found in the ground that is mined for fuel?
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What is the name of a representation of the Earth on a piece of paper?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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In Wyndham, Australia, it was 90 degrees for how long?
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What is the common name for the Cenozoic Era?
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Which of these is the longest river in the world?
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What weather-related term comes from Greek words for "high in the sky" and "knowledge"?
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Hot, hazy weather mixed with pollution leads to what?
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