Earth
What is the wearing away of parts of the Earth by water or wind called?
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How long does it take for the Earth to rotate around completely on its axis?
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How many days a year is the sun invisible at the North Pole?
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Which is the common name for the top layer of the zone of saturation?
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Which of the following items is a tool used to tell time by the sun's movement in the sky?
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What type of gem is the Star of Africa or the Cullinar II?
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