Earth

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

More Questions from Earth
Which of these terms can be used to describe steam?
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What direction does a compass needle point to?
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Where is the type location for the Permian Period?
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How many miles long is an average bolt of lightning?
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Rapidly descending air beneath a thunderstorm is what?
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Which of these rivers flows north?
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Where would you find the abyssal plain?
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Which body part is also a name for the center of a hurricane?
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