Earth

A clear sky contains very few what?

More Questions from Earth
How cold does it need to be outside before it can snow?
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What is the opening that spews out lava called?
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What does the term "geocentric" mean?
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Earthquakes sometimes cause "tidal" what?
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Which unit measures atmospheric pressure?
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What kind of rain is bad for the environment?
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Where in Arizona is the sun blocked 10% of the time?
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What is another name for the "Humboldt Current"?
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