JEREMY BISHOP / SCIENCE PHOTO LIBRARY JEREMY BISHOP / SCIENCE PHOTO LIBRARY
Volcanologist with a camcorder by a lava flow on the volcano Mount Etna. Lava (molten rock) emerges from beneath the Earth's surface in a volcanic eruption. When it solidifies, it forms the dark black rock surrounding the flow. Mount Etna stands 3323 metres tall on the Italian island of Sicily. It is the largest active volcano in Europe.
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