Earth

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

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What is a downburst covering an area smaller than 2.5 miles in diameter called?
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Broken river ice stuck in a narrow channel causes what?
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Confluence is the opposite of what?
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What type of radar measures radial velocity?
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What is the current era in the geologic time scale?
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What is the main cause of caves?
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One needs to travel to which state in New England to see the highest tides?
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What type of topography describes caves, caverns, and sinkholes?
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