Science

What is a lever?

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The definition of "clouds composed of small particles, mostly ice crystals" best fits which science term?
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What percent of the Sun, by weight, is helium?
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A "philatelist" is a what?
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What dust-like particles are only found on plants like ferns, mosses and mushrooms?
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Which is the organelle involved with waste removal?
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The leading edge of an advancing cold air mass is known as what?
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What force slows down a rolling ball?
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The term, "black hole", was named by American physicist, John Wheeler, in which year?
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