Science
What tool do people at sea use to measure distance with echoes?
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An isogeotherm is an imaginary line connecting points of equal temperature where?
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Which inhospitable desert holds the world's richest deposits of dinosaur remains?
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Which is the notion that living things can come from nonliving things?
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Who is credited with creating the "Big Bang Theory"?
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Which of these measurements of distance is the longest?
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What scientist discovered that sunspots occur in an eleven-year cycle?
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