Science

What must occur for electricity to flow?

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If a jet cruises at 575 mph, how far will it go in 12 hours?
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What does ER (of a cell) stand for?
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John Glenn was the first American to orbit the earth, in how long a flight?
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Which of these is similar to the way sound travels?
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What is a giant crack in a rock called?
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Who was the commander of the first U.S. Space Shuttle mission?
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Which of the following is a type of cloud?
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Which star is the brightest star in the northern sky at night?
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