NASA's Aqua satellite took this image off Tonga in March, 2008.
The bright blue green of the water is due to suspended particles with the bright white patch likely due to released steam. Above this is a raft of pumice, the stuff we use for keeping our feet smooth. It's very light, made from solidified ash and floats on the surface.
The columns of steam and ash shot 10 kilometres into the air.
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