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To: plain talk

Gas bubble in lava that eroded away.

Mystery solved!

10 posted on 06/24/2017 8:35:25 AM PDT by VanShuyten ("...that all the donkeys were dead. I know nothing as to the fate of the less valuable animals.")

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To: VanShuyten

Did you mean Mars farted?

62 posted on 06/24/2017 9:29:02 AM PDT by antidemoncrat

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To: VanShuyten

Yep- here is a great photo of such a lava rock bubble a few pics down on this page:
http://www.geol.umd.edu/sgc/GEOL388/lectures/02.html

94 posted on 06/24/2017 11:21:35 AM PDT by piasa

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