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An Entity of Type : prov:Entity, within Data Space : wifo5-40.informatik.uni-mannheim.de:8890 associated with source dataset(s)

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  • This gave the continental rocks plenty of time to build up big helium-gas stores via the decay of radioactive elements in the crust. (Most helium created on Earth comes from uranium and thorium.) The helium was probably trapped both in rocks and in fluids such as groundwater.
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