Science

What is the name for a tool that makes work easier to do?

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What is water stored beneath the surface of the Earth called?
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Which is the planet with the greatest average density?
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What sort of electricity do you get when you rub two balloons and they stick together?
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Which of these best describes how light travels?
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How many coulombs does one ampere-hour equal?
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What is the part of a plant that serves primarily as the plant's food-making organ?
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What is an LED?
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What is Earth's nearest neighbor in space?
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