Science
What space object did some ancient cultures rely on to tell the passage of time?
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What is the proper name for a "sundog", or an atmospheric optical phenomenon?
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What type of cell doesn't have membrane around its nuclear material?
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How many tons of meteor dust fall to Earth every day?
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What word is given to sounds that are too high for humans to hear?
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Which of the following energy sources do gardens rely on most for survival?
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Where would you find the zone of polarizing activity?
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What are plants that grow, flower, make seeds and die in one year?
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