GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Erupting stratovolcano. Cutaway artwork showing the internal structure of a stratovolcano during an eruption. A stratovolcano is a type of volcano that has many layers, or strata, that are formed by successive volcanic eruptions. The layers build up to form the cone shape seen here. The eruptions are fuelled by lava (orange) rising up a central vent, although side vents can also form. The side vent at right has broken through to the surface, while the one at left has yet to reach the surface. Lava is seen flowing down the sides of the volcano, threatening the fields and houses below. The lava rises from a magma chamber (bottom centre) deep below the volcano. An example of an active stratovolcano is Mount Etna in Sicily, Italy.
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