DR KEN MACDONALD / SCIENCE PHOTO LIBRARY DR KEN MACDONALD / SCIENCE PHOTO LIBRARY
Lava flow. Close-up of a lava flow formed at a deep ocean hydrothermal vent. This is a sheet form of lava, forming relatively flat structures after cooling, as opposed to the pillow shapes that can form. The lava flow originated as molten rock (magma) from inside the Earth. When the molten rock makes contact with the cold water it rapidly solidifies, forming a hard crust. Photographed on the East Pacific Rise.
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