ADAM G. SYLVESTER / SCIENCE PHOTO LIBRARY ADAM G. SYLVESTER / SCIENCE PHOTO LIBRARY
Lava measurement. Volcanologist, in protective clothing, taking a measurement near a lava flow. The glowing lava (molten rock) can be seen through a hole (at lower right) in the crust of black, solidified rock which has formed over it. A lake of lava can also be seen in the background at upper right. The silvery appearance of the volcanologist's clothing helps to reflect heat. Photographed on the La Fournaise volcano on the island of Reunion in the Indian Ocean.
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