Earth

What scientist purposed the theory of continental drift?

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How many moons does Earth have?
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A clear sky contains very few what?
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John Glenn first orbited the earth in what year?
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Sudden flooding caused by heavy rain is called what?
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What is another name for layers of rock?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What was the name of the volcano that used to be Crater Lake?
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A weather proverb says "A year of snow," followed by what?
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