CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Formation of a volcano. Computer artwork showing a volcano forming. Lava (red) forces its way to the surface from a magma chamber deep underground. Repeated eruptions of lava and ash (upper right) form the layers of a volcanic cone (stratovolcano). This eventually becomes dormant, but often still emits steam and may become active with new eruptions if the magma rises to the surface again.
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