Science
A ramp is an example of which of these simple machines?
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Which kind of tree is most often struck by lightning?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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What is the substance that gives plants their green color?
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What is the name of an instrument that records vibrations in the Earth's crust?
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What is the reproductive organ of most seed-bearing plants?
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What is a long balloon filled with helium generally called?
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What form of energy are we using when we use an alarm clock or a dishwasher?
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