Science
How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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What process refers to the joining of pollen with an ovule to form a seed?
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What is molten rock beneath the surface of the earth called?
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Which of these measurements of distance is the longest?
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What is a steep-sided circular depression commonly known as?
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Which of these is a famous astronomer for whom a comet was named?
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What is the irregular and instantaneous motion of air called?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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