Olivine heated under pressure in the presence of water is the less likely option....and vented close to the surface and then only seasonally. Sounds like life is the better option. Occam’s easer.
NASA issues a statement about the methane on Mars. https://www.nytimes.com/2019/06/22/science/nasa-mars-rover-life.html …pic.twitter.com/PFxIO5WOlt
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