JEREMY BISHOP / SCIENCE PHOTO LIBRARY JEREMY BISHOP / SCIENCE PHOTO LIBRARY
Volcanologist wearing a heat suit as he stands by an eruption of glowing lava (molten rock), ash and vapours from the volcano Mount Etna. The lava can range in temperature from 475 degrees Celsius (dim red) to 1150 degrees Celsius (white). The suit is designed to protect the researcher from this heat. Other dangers on the slopes of a volcano include poisonous gases, such as hydrogen sulphide, and lava bombs, chunks of molten rock ejected by the volcano. Mount Etna, standing 3323 metres tall on the Italian island of Sicily, is the largest active volcano in Europe. Photographed in 2000.
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