In the previous sections, I endeavoured to describe the current state of understanding of the geochemistry of noble gases in the mantle compared to the elemental and isotopic compositions of the Sun and chondritic meteorites. The modest knowledge of the Martian interior and its atmosphere, thanks to analyses of SNC meteorites, also offers an essential constraint on the origin of volatiles in terrestrial planets. In the following, I will provide general ideas about the origin of noble gases on Earth, and the evolution of the mantle/atmosphere system. Understanding of origin of volatiles in terrestrial planet atmospheres has been explored extensively...

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