Earth

From which does the Global Positioning System receive its information?

More Questions from Earth
Which of these is not a type of coral-reef shoreline?
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What happens to the air pressure as we increase our altitude?
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What are the fastest and strongest global winds called?
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In which country is Fiordland, which contains the Milford Sound fiord, located?
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How are pockets of air in soil made?
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Which of these might help keep erosion near a stream from happening?
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How often is the earth hit by lightning?
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What percentage of rock-forming minerals are silicates?
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