Earth

From which does the Global Positioning System receive its information?

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Which scale is used to describe a mineral's hardness?
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What must fossilize in order to form a coprolite?
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What name is given to 23.5 degrees north latitude?
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Where is an earthquake's epicenter?
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Which of these is the Greek name for the east wind?
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What disaster is a combo of downdrafts and updrafts?
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What word means a mild or moderate temperature?
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Which unit measures atmospheric pressure?
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