document: Undersea volcanoes don &#39; t just ooze , they also explode And study that finds high levels of carbon dioxide confirms it , scientists say Deep-sea volcanoes can explode instead of just oozing , scientists now confirm . The new proof - higher-than-expected levels of carbon dioxide in the magma from a volcano off the coast of Oregon - suggests the volcanoes may play a greater role in global climate than thought . Of all the volcanic activity on Earth , 75 percent to 80 percent of it takes place at deep-sea ridges in the middle of the oceans . Most of these volcanoes apparently spew out huge volumes of lava instead of erupting explosively , as many volcanoes on land do . It is a high level of gas trapped in a volcano 's magma that normally fuels explosive volcanic bursts . This level has long been thought to be low at mid-ocean ridges ; moreover , potential undersea explosions would be suppressed by the crushing pressure from the surrounding water . However , based on volcanic ash found at certain sites , geologists have speculated over the last decade that explosive eruptions do take place in deep-sea volcanoes . Now researchers say they have proof .
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