DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Yellow sulphur deposits around a vent on Mount Iwo, or Naked Mountain, Japan. Mount Iwo is a volcano in the Akan Volcanic Complex on the island of Hokkaido. Sulphur deposits are formed when hot sulphurous gases from the volcano condense and solidify when they meet the cooler air and rocks. The main gases involved are gaseous sulphur itself and hydrogen sulphide, which is oxidised by the air to sulphur and water. The mountain was once mined for sulphur.
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