Labels:ball | book | bulletin board | press | shelf OCR: To answer this question Allegre and his colleagues studied the isotopes of rare gases These gases including helium argon and xenon have the peculiarity 0f being chemically inert thatis they do not react ir nature with other elements Two of them are particularly important for atmospheric studies: argon and xenon Argon has three isotopes of which argon 40 is created by the decay of potassium 40 Xenon has nine of which 129 has two different origins Xenon 129 arose as the result of nucleosynthesis before the earth and solar system were formed. it twas also created from the decay of radioactive iodine 129 which does not exist on the earth anymore This form of iodine was present very early on but has died since and xenon 129 has grown at its expense CONTINENTAL SHIFT has altered the face of the ...
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