Eruptions are driven by the rapid expansion of bubbles formed from water and other volatile substances trapped in molten rock as it rises beneath a volcano, and the scale of the eruption is determined during the first 10 seconds of bubble growth in the rocks, scientists at McGill University in Montreal reported. It's like shaking a bottle of a carbonated soda and then opening the lid, they said, and whether the drink -- or a volcano -- erupts dramatically of slowly is a function of bubble growth and gas loss. The McGill researchers examined the growth of volcanic bubbles in real time by heating water-bearing molten rock with a laser. Initially thousands of small bubbles per cubic centimeter formed, trapping gas inside them, but they swiftly coalesced into a foam of larger bubbles whose strength rapidly decreased while the rate of gas loss increased. While in most cases gas escapes rapidly enough to outpace bubble growth, resulting in smaller eruptions, under exceptional rates of bubble expansion large eruptions may result, the study found. Even molten rock with small amounts of water has the potential to create devastating, large eruptions, the scientists said.
The largest active volcanos The largest active volcanos Part of the world Name Name Arrangement Height, m Europe EuropeAetna Sicily Island 3340 Hvannadalsh- nukur Island Iceland 2119 Hecla 1491 VesuviusItaly1277 Asia AsiaDemavendIran5604 Kluchevskoy Kamchatka Peninsula 4750 Kerinchi Sumatra Island 3805 Fujiyama Honshu Island 3776
The largest active volcanos The largest active volcanos Part of the world Name Name Arrangement Height, m Africa Africa Meru MeruTanzania4567 KarisimbiRwanda4507 Phaco Cameroon4070 Teide Canary Islands 3718 North America OrizabaMexico5700 PopocatepetlMexico5452 SanfordAlaska4939 AntarcticaErebus Ross Island 3794
The largest active volcanos The largest active volcanos Part of the world Name Name Arrangement Height, m South America South AmericaLyulyaylyako Chilі - Argentina 6723 San Pedro Chilі6154 AntofalyaArgentina6100 Australia and Oceania and OceaniaМауна-ЛоаHawaii4170 Ruapehu New Zealand 2796 Ulavun New Britain Island 2300
Active Volcano Europe Aetna Active volcano Aetna Hvannadalshnukur Active volcano Hvannadalshnukur
Active Volcano Europe Hecla Active volcano Hecla Vesuvius Active volcano Vesuvius
Active Volcano Active Volcano Europe Europe Active volcano in eastern Kamchatka - Klyuchevskii Ruiz active volcano before the eruption in 1985.