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 .
extractive_keyphrases: carbon dioxide midocean ridges deepsea thought 80 percent oregon surrounding volcano ooze undersea volcanoes explode instead potential undersea explosions volcanoes crushing pressure magma volcanic activity explode takes trapped global climate greater role suggests researchers speculated scientists normally fuels volcanic lava instead certain sites suppressed eruptions take place ridges explosive finds coast play huge volumes found
abstractive_keyphrases: proof higherthanexpected earth 75 percent oozing scientists these volcanoes apparently deepsea volcanoes carbon dioxide confirms speculated over explosions been thought dioxide climate activity pressure