El Hierro volcanic eruption, satellite image. North is at top. Clouds are white. El Hierro is a volcanic island, the smallest of the Canary Islands (located in the Atlantic Ocean near Africa). It is less than 50 kilometres across. Here, a shallow underwater volcanic eruption (known as a Surtseyan eruption) near the southern coast has produced ash that has discoloured the waters to the south and west (green, lower left). This eruption began in July 2011 and is still ongoing as of 2012. Image taken on 1 November 2011 by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra satellite.
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