Earth

What is the origin of dinoflagellates?

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A clear sky contains very few what?
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Hot, hazy weather mixed with pollution leads to what?
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Which of these rivers is most likely a glacial boundary river?
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What do the Japanese call a hurricane?
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Which of these planets is smaller than Earth?
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What is petroleum as found in the earth, before it is refined?
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What is the boundary between two air masses called?
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What is a seven-letter word meaning "movement of weathered material from gravity"?
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