STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Aa lava. Molten aa lava flowing over cooled kalanchoe lava. Aa lava is basaltic lava characterized by a rough, jagged surface composed of broken blocks of lava known as clinker. Photographed on Kilauea volcano, Hawaii, USA.
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