NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Volcano types, artwork. At top left is a type volcanic eruption known as a pyroclastic flow, or nuee ardente (glowing avalanche). This is a highly destructive phenomenon that consists of a very hot cloud of volcanic ash, dust and gases. At top right is a shield volcano, a large volcano with gently sloping sides. Its shape is the result of the highly fluid lava that it erupts. At bottom is a stratovolcano, a 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.
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