Earth

How cold does it need to be outside before it can snow?

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What is the name of any body of igneous rock named for the Roman god of the underworld?
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Which type of irrigation is most commonly used throughout the world?
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Mary Anning was the first to discover complete fossils of which prehistoric marine reptile?
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Which is the common name for the top layer of the zone of saturation?
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What type of power did the ancient Persians use to grind grains?
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If you are going to Florida Bay from the everglades which direction would you travel?
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What substance, added to fog, makes smog?
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What must happen for a tree to become a fossil?
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