Earth

What instrument measures altitude?

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What kind of tides are influenced by the moon and sun?
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Rapidly descending air beneath a thunderstorm is what?
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How many times does lightning strike the Earth every second?
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Which of these rivers flows north?
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What type of rock is coal?
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What type of glacier is Greenland or Antarctica called?
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What is the process that removes salt from sea water?
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Which one of these is most alkali?
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