Science

What tool do people at sea use to measure distance with echoes?

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Dolly was the first ever living creature to be cloned. What type of animal was she?
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Absolute Zero Temperature is reached at?
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What is matter that allows light to pass through called?
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How many astronauts walked on the moon before 1970?
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The term, "black hole", was named by American physicist, John Wheeler, in which year?
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What is the full name for CFCs?
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Which is the only planet that rotates clockwise?
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