It is well known that volcanoes under water produce magma and lava frequently. 80% of all volcanic activity is caused under the sea level.but until recently, it has been unknown wether or not they erupt. a PhD student found crystals containing very high CO2 levels in the magma trapped inside of the crystals.this represents magma in a state prior to eruption,which proves eruption can occur.
http://www.physorg.com/news/2011-03-deep-sea-volcanoes-dont-lava.html
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