Earth

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

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Where is the deepest land gorge on Earth?
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Where is most of the earth's gold located?
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What is the process that removes salt from sea water?
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Earthquakes sometimes cause "tidal" what?
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What is not an example of a halide?
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What polluting material can choke an animal by getting caught around its neck?
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When does magma become lava?
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What is another name for an estuary?
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