<Li> The volcano was directly under the jet stream . </Li> <Li> The direction of the jet stream was unusually stable at the time of the eruption's second phase, continuously southeast . </Li> <Li> The second eruptive phase happened under 200 m (660 ft) of glacial ice . The resulting meltwater flowed back into the erupting volcano, which created two specific phenomena: <Ol> <Li> The rapidly vaporising water significantly increased the eruption's explosive power . </Li> <Li> The erupting lava cooled very fast, which created a cloud of highly abrasive, glass - rich ash . </Li> </Ol> </Li> <Ol> <Li> The rapidly vaporising water significantly increased the eruption's explosive power . </Li> <Li> The erupting lava cooled very fast, which created a cloud of highly abrasive, glass - rich ash . </Li> </Ol>

What happened in the icelandic volcano eruption in 2010