Assertion: argon | /r/AtLocation | earth
Facets:
Source sentences:
text: The main isotopes of argon found on Earth are 40
text: Although the stable isotopes argon-36 and argon-38 make up all but a trace of this element in the universe, the third stable isotope, argon-40, makes up 99.60 percent of the argon found on Earth.
text: The main isotopes of argon found on Earth are Ar-40, Ar-36, and Ar-38.
text: The main isotopes of argon found on Earth are 40Ar, 36Ar, and 38Ar.
text: There are several stable isotopes (where the nucleus contains different numbers of neutrons) of argon on earth and each comes from a different source: argon-40 results from the decay of potassium-40 in rocks (nearly all argon found on earth is this isotope); argon-36 is produced directly by nuclear reactions in stars (most of the argon in solar winds is the argon-36 isotope); and argon-38, which is vanishingly rare on earth, appears to have either unknown or multiple sources.