Science

What is the repeated sound when sound waves bounce off other objects called?

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What satellite series was known as "fellow traveler"?
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Which of the following items has the most mass?
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What unit of mass is equal to a thousand grams?
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Which sea is not found on the earth's moon?
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When were the first world climate maps charted?
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What is the scientific word for push or pull?
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What do you call horizontal movement of water?
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When a dog repeats a learned behavior and gets a reward, what process is shown?
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