HANK MORGAN / SCIENCE PHOTO LIBRARY HANK MORGAN / SCIENCE PHOTO LIBRARY
Geologist at work. A geologist uses a gas analyser to study the composition of a sample from a lava field on Mount Kilauea, Hawaii, one of the world's most active volcanoes. He is kneeling on the crust of solidified lava, which may hide active lava flows just metres below.
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