Science

What are materials that come from the earth called?

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What percent of the Sun, by weight, is helium?
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What is a steep-sided circular depression commonly known as?
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The physicist Marie Curie was awarded the Nobel Prize in which year?
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First appearance of light in the eastern sky before sunrise best fits which term?
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Which planet was discovered in 1781 with the help of Bode's Law?
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What is a return of the electron beam to the top of a television picture tube?
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What is a sudden violent explosion on the sun called?
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How many astronauts walked on the moon before 1970?
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