Earth

Which is heavier, cold air or warm air?

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What is the cooler air rushing down a mountainside called?
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Who issues severe weather advisories in the U.S.?
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Mary Anning was the first to discover complete fossils of which prehistoric marine reptile?
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What is the very bottom soil horizon called?
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Where are the Horse Latitudes located?
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Earthquakes sometimes cause "tidal" what?
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What name is used specifically to describe the region around the South Pole?
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What is the hardest mineral known on Earth called?
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