Earth

Which of these pairs of elements was discovered before the 14th century?

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Rapidly descending air beneath a thunderstorm is what?
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What is the highest mountain, considering just the contiguous United States?
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What cloud has a flat, sheetlike appearance?
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What event happened when water droplets were on a spider's web but it hadn't rained?
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What is America's federal weather agency called?
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Which of the world's oceans is larger than all of the Earth's land area combined?
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What name is used specifically to describe the region around the South Pole?
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What is a region of Earth in which all areas share the same time called?
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