SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Vladimir Ivanovich Vernadsky (1863-1945), Soviet geochemist and mineralogist. Vernadsky's major contribution was the concept of the noosphere, a stage in the evolution of the Earth beyond the geosphere and biosphere. He also carried out pioneering work in geochemistry, biogeochemistry, and radiogeology. Photographed in 1940.
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