Ecuador and the Galápagos, July 23 - August 7, 2007 / 20070806g_JamesPuertoEgas_LavaBubbles
Ruth Milner, rmilner plus web at bookofmarvels dot net
12/21/2007
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20070806g_JamesPuertoEgas_LavaBubbles Lava Bubbles, Puerto Egas

These look very much as though bubbles of air in the lava popped while it was cooling, leaving a small depression into which the crumpled top side collapsed.