Science
What liquid is used as a standard when measuring density?
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What is the repeated sound when sound waves bounce off other objects called?
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Which planet is the impact crater named the "Caloris Basin" found?
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Halley's Comet is predicted to appear again in which year?
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How many years does it take for Mars to go around the Sun for a complete revolution in its orbit?
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What is matter that doesn't allow light to pass through called?
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