Ecuador and the Galápagos, July 23 - August 7, 2007 / 20070806o_Bartolome_LavaTubes
Ruth Milner, rmilner plus web at bookofmarvels dot net
12/21/2007
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20070806o_Bartolome_LavaTubes Lava Tubes, Bartolome

These things that look like rivulets are collapsed lava tubes