Earth

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

More Questions from Earth
What theory proposes that Earth is made of plates that move?
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What periods of the Earth's history had glaciers covering a lot of the Earth?
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What piece of material attracts iron and some other metals?
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How much of an iceberg appears above the water line?
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What happens to the pressure of water as depth under the water increases?
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What soft brown coal that has lost all of its moisture called?
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What is an uplifted area with a flat top called?
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What kind of tides are influenced by the moon and sun?
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