Earth

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

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What reef is the largest living structure on Earth?
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What was the name of the volcano that used to be Crater Lake?
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What is a scientist who specializes in soil and crops called?
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The bottom layer of the atmosphere is called what?
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What is it called when a plant produces two kinds of sex cells?
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Where in Arizona is the sun blocked 10% of the time?
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Which of these terms means "protecting and using a resource wisely"?
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What is the imaginary line that runs from the North to the South Pole called?
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