Science

Which of these particles was discovered first?

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Earthmen first sent a spacecraft to which planet?
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What was so unusual about the Mercury space flights?
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Which scientific term means "a small body of water"?
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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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Which planet has visible rings around it?
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What does a ruler measure?
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An isogeotherm is an imaginary line connecting points of equal temperature where?
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What cells store food in the roots?
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