Science
Which of these is the best definition of a compound machine?
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What is a spacecraft that orbits planets, moons or other large space objects called?
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Dimples on golf balls help increase speed by reducing what?
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What is a long balloon filled with helium generally called?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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Transfer of heat through a substance by molecular action best fits which science term?
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Which is the planet with the greatest average density?
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Which of these things should you do during a thunderstorm?
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What electronic device only allows current to flow in one direction?
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