G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Lava entering ocean. Night view of lava from Kilauea volcano pouring into the sea at the coast of Big Island, Hawaii, USA. It is seen here pouring out of a lava tube. Lava tubes are formed when the outer surface of a lava flow cools and solidifies in contact with the air. The inner parts of the flow remain molten, however, and continue to flow through the tube. Kilauea is one of the world's most active volcanoes, and is in continuous eruption. The black rock of the Hawaiian islands is all made of solidified lava, and flows such as this mean the islands are still increasing in size.
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