1 of 25: This image provided by NOAA shows the volcanic plume, from Wednesday's eruption of a volcano beneath Iceland's Eyjafjallajokull glacier. Using sulfur dioxide concentration data from the NASA Aura/OMI satellite sensor, it shows smoke, ash, and other components that can cause aircraft jet engines to fail. The OMI sensor can distinguish the differences between cloud, smoke, dust, ozone and other aerosols, and is important in Earth observations for aviation safety. ((AP Photo/NOAA))

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