Earth

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

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What is an underwater boat with its own power and air supply called?
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Most minerals may be identified using the following methods except which?
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What is sedimentary rock composed primarily of sand-sized grains?
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The Appalachian Mountains are best described as what type of mountains?
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What is the solid form of water?
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What is the energy released from the sun called?
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Which of these types of pollution occurs naturally?
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In the U.S., the spring equinox occurs in what month?
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