Science
What famous scientist introduced the concept of "space-time"?
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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 is the distance that light travels in a year called?
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The leading edge of an advancing cold air mass is known as what?
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Sudden, transient motion or trembling of the earth's crust best fits which science term?
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What are the "Big Dipper" and "Orion" examples of in the night sky?
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