Earth

What was the nationality of the scientist who demonstrated a heliocentric system?

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Hot, hazy weather mixed with pollution leads to what?
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At what point would one be standing if the trees were stunted?
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John Glenn first orbited the earth in what year?
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Who issues severe weather advisories in the U.S.?
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How long does it take the earth to rotate around its axis?
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What line is at 0 degrees latitude?
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What is the natural process by which rocks break down into smaller chunks?
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How old do scientists think the Earth is?
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