Earth

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

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What is the boundary between two air masses called?
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What natural disaster is said to be 100 times greater than an atomic bomb?
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Which of these is the first step in the making of a fossil?
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How old do scientists think the Earth is?
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What type of glaciers fill up the gaps between mountains?
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Which of these is another name for dirt?
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What basic cloud formation resembles cauliflower?
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How long does it take for the Earth to rotate around completely on its axis?
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