Science

What is another name for a "shadow clock"?

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What are produced in the anther of a flower?
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Where would you find the zone of polarizing activity?
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Which of the following is not a constellation?
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How many years are in a sunspot cycle?
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What is Neptune's period of revolution around the Sun?
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About how often does Halley's Comet return?
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Which of these is considered "work"?
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What is Jupiter mostly made of?
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