Science
What do our bodies need from the air we breathe?
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What is the place where projectors are used to show the night sky?
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What dust-like particles are only found on plants like ferns, mosses and mushrooms?
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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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Deep trenches such as the Grand Canyon were formed by what process?
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In which constellation does the vernal equinox appear?
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What is caused when the Moon moves into the Earth's shadow?
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What is the distance between two peaks of a wave called?
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