Second try at posting this email: Hello Everyone, I been researching but I can't find the answers to two questions. First, what is the mechanism by which atmospheric gasses are trapped in the formation of basalts? I have been doing some lit reviews on martian meteorites and I find it interesting that some were formed in magma chambers deep undergound. indeed, some are thought to have formed several kilometers down. How does the Martian atmosphere get trapped in cooling rock so far underground. Second, when determining Cosmic Ray Exposure ages, can atmospheric fragmentation and ablation of a meteoroid affect the results from such testing and if so, how are fragmentation and ablation taken into consideration when determiniing CREs? Thanks to anyone who can help me understand these processes. -Walter Branch
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