Comment on More ‘bubbles’ from Curiosity – a lot of them by Chris Phoenix

(Before It's News)

They look very much like what happens when water soaks through sandstone, carrying minerals, and then evaporates from the surface. The higher points get more mineralized, thus erode more slowly, thus stick up higher as the rest of the rock retreats.

Since the mineralization would be just on the surface layer of the cone/bubble, then a change in conditions that knocked the top off the cone would expose the weaker inner volume, which would then erode downward, leaving the walls unsupported, eventually leaving a crater.

http://themeridianijournal.com/

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