Science

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

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What does splitting a laser light into two beams through a silver mirror make?
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A ramp is an example of which of these simple machines?
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What kind of radiation can be described as infrared?
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What tool uses a magnetic needle that points north?
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Which characteristics do organisms use to help them survive in their environment?
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Which of these is considered "work"?
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What system of measurement is used in science?
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Which of these scientific terms is defined as the solid surface layer of a planet or moon?
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