JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Air compressor at an iron ore mine. This air compressor is in the engine house of the former U.S. Steel Soudan iron ore mine, now the Soudan Underground Mine State Park, Minnesota, USA. Visitors can descend half a mile underground to tour the mine or visit the Soudan Underground Laboratory. The laboratory houses particle physics experiments, including MINOS (Main Injector Neutrino Oscillation Search), designed to study the phenomena of neutrino oscillations.
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