Earth

What is the very bottom soil horizon called?

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Approximately what fraction of the Earth's air is made up of oxygen?
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Red sky in morning, sailors take what?
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What does a konimeter measure?
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What is the place where an air mass forms called?
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What word means "the shakes that come after the earthquakes"?
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Which of these is the longest river in the world?
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What is another name for green beryl?
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