Earth

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

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What is the very bottom soil horizon called?
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Lightning struck what eight times in 24 minutes?
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What region surrounds the North Pole?
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The Appalachian Mountains are best described as what type of mountains?
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What instrument indicates wind direction?
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What is the opening that spews out lava called?
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Which star is the closest one to Earth?
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How old is the earth?
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