Science
What is the waxy covering on plant leaves?
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Which planet in Earth's solar system has the largest diameter?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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The term, "black hole", was named by American physicist, John Wheeler, in which year?
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What are solid particles that produce color by absorbing or reflecting light called?
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What are the first four planets in the solar system called?
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