STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Pahoehoe lava. Molten pahoehoe lava breaking through its outer crust. Flames show where the lava has flowed over vegetation, igniting it. This thick lava with a ropey texture can flow at speeds of up to 50 kilometres per hour. Pahoehoe is a basaltic lava with a low melting point. The crust insulates the lava keeping it molten and able to travel great distances from its origin.
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