G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Pahoehoe lava. Pahoehoe lava flow from Kilauea Volcano, Hawaii, USA, lit by moonlight. This thick ropy-looking lava may flow at speeds of up to 50 kilometres per hour. Pahoehoe lava is a type of basic lava with a low silica content, giving it a low melting point. This means the lava can travel great distances from the crater or vent from which it was issued.
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