Earth

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

More Questions from Earth
What fuel comes from the remains of 300-million-year-old decayed fern plants?
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What are mounds of sand that have been windblown called?
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What does the Saffir-Simpson scale measure?
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What is another name for the "Humboldt Current"?
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What kind of calendar traditionally predicts the weather?
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The Hawaiian Islands are a good example of which type of volcano?
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What is the opening that spews out lava called?
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What term describes warm and excessively humid weather?
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