JEREMY BISHOP / SCIENCE PHOTO LIBRARY JEREMY BISHOP / SCIENCE PHOTO LIBRARY
Lava flow on the slopes of the volcano Mount Etna, with a molten boulder. Lava is molten rock that is produced by volcanoes as an upwelling of the magma found beneath the Earth's crust. The lava can range in temperature from 500 to over 1000 degrees Celsius. It has a chemical composition specific to its volcano. Lava flow speeds vary, but they are generally viscous and slow-moving. They will slowly solidify to form black volcanic rock. Mount Etna stands 3323 metres tall on the Italian island of Sicily. It is the largest active volcano in Europe.
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