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Science, Math & Nature

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Across
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Lowest level of the atmosphere
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Majority of the sun is made up of ______
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Elementary particle that is a unit of light
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A system of rapid mental math calculation
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Planet with the most moons
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68% of the universe
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Thickest layer of Earth
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An element that is liquid at room temperature and pressure
Down
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Transports oxygen to and from the tissues
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A fundamental relation among three sides of a right triangle
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These crustaceans don't die of old age
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Second element on the periodic table
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This fruit takes two years to grow
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Nocturnal birds that don't have eyeballs
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Newton's laws of ____
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Positively charged subatomic particle
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Father of modern physics