Earth

What instrument measures altitude?

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What is the opening that spews out lava called?
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What layer of the Earth's atmosphere contains the ozone layer?
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Approximately what fraction of the Earth's air is made up of oxygen?
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In which country is Fiordland, which contains the Milford Sound fiord, located?
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What is a front that does not advance called?
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What type of rock is coal?
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What makes Florida's Tampa Bay a unique aquatic environment?
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