G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Lava flow entering the sea on the coast of Big island, Hawaii, USA. Lava reaches volcanoes from the Earth's interior through faults in the crust, and is forced through them by the high pressure within the Earth. The black rock of this coastline is made from old lava flows that have solidified. Lava flows like this mean that the Hawaiian islands are still increasing in size.
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