National Geographic News

Ripples of Pahoehoe

Photograph by Jeff Gnass

Cooled lava lies in icing-like ripples in Hawaii Volcanoes National Park. This image shows ropy pahoehoe, a type of basaltic lava that forms when solidifying lava meets an obstruction. Hot lava underneath the hardening crust continues to move it along, forming wrinkles in the process.

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