STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Lava fountains. View of lava fountains (upper left) feeding a large river of lava on Mauna Loa volcano, Big Island, Hawaii, USA. Lava is molten rock which is forced to erupt onto the Earth's surface by high pressure within the Earth. Mauna Loa is one of five large volcanoes on Hawaii's Big Island.
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