Science
What is a steep-sided circular depression commonly known as?
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What are plants that need two years to complete its life cycle?
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Which of these scientific terms is defined as the solid surface layer of a planet or moon?
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What is matter that allows light to pass through called?
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Which star is the brightest star in the northern sky at night?
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What is the generic term for very small loose particles of hard, broken rock or minerals?
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What famous scientist introduced the concept of "space-time"?
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