Science

What is a giant crack in a rock called?

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Scott and Worden were crewmembers on which Apollo mission?
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How fast does light travel in one second?
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John Glenn was the first American to orbit the earth, in how long a flight?
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What is a geiger counter used to measure?
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What kind of power do sailboats use?
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What is a return of the electron beam to the top of a television picture tube?
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Discovered by Alexander Fleming, what is now used to treat infections?
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What does the first "A" in NASA stand for?
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