Earth

From where does 90% of the water vapor in the air come?

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What does a pluviometer measure?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What is the test that can help determine the hardness of a rock called?
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On which continent is the biggest area of rain forest found?
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What storm is the opposite of an anticyclone?
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What is the imaginary line that runs around the Earth halfway between the poles called?
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Which of the following minerals is the hardest?
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Which of these African watersheds is the largest in size?
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