malenadance
malenadance malenadance
  • 26-02-2017
  • Chemistry
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how does helium form

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ArabellaDeangelis
ArabellaDeangelis ArabellaDeangelis
  • 27-02-2017
Most terrestrial helium present today is created by the natural radioactive decay of heavy radioactive elements called Thorium and Uranium.
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