Earth

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

More Questions from Earth
Which is heavier, cold air or warm air?
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What is the name of the limestone formation that rises from a cave floor?
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Yosemite National Park is an easily recognizable part of what batholiths?
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What do the Japanese call a hurricane?
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Which mineral is not likely to be a replacement mineral in fossils?
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Which type of eclipse occurs when the earth sits directly between the sun and the moon?
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What arc is created by refraction and light?
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How often is the earth hit by lightning?
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