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Day Nine: Galapagos - Isabela Island - Marine Iguanas, Giant Tortoises, and Penguins!  »  IMGP8969.jpg
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A'a lava rocks. A'a is a Hawaiian word, and distinguishes this type of lava formed when the lava has lots of trapped gas in it from pahoehoe lava which is more undulating and ropy and less gaseous.


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