G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Lava flow. Dribble of molten pahoehoe lava flowing into the ocean at the Hawaiian coast. This lava flow originated from the Kilauea volcano, which is one of the world's most active. Pahoehoe lava is a fast-flowing lava which typically solidifies into the twisted ropy forms seen here. The black rock which comprises the Hawaiian islands is entirely made from old lava flows. The continuous emissions from volcanoes such as Kilauea mean that the Hawaiian islands are still increasing in size.
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