Earth

On October 11, 1999 the world population hit a milestone of how many?

More Questions from Earth
What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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To which island group do Kwajalein and Eniwetok belong?
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What substance, added to fog, makes smog?
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Which of these planets is smaller than Earth?
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What is the study of atmospheric conditions and climate called?
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What is the boundary between two air masses called?
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Which of these is a warm spell of weather when ice and snow melt?
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Which unit measures atmospheric pressure?
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