Earth

Approximately what fraction of the Earth's air is made up of oxygen?

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Al Gore made a film about what climate issue?
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How are pockets of air in soil made?
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Which is NOT a type of drainage pattern?
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What kind of calendar traditionally predicts the weather?
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What is the length, in miles, of the San Andreas Fault?
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What kind of scientist would study rocks, minerals and mountains?
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What might you find on the grass after a cool summer night?
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What is a front that does not advance called?
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