theIASHub | 20 Dec, 2023
Context: A volcano that had rumbled for weeks erupted in southwestern Iceland.
Volcano
oThe buoyancy of the magma,
oThe pressure from the exsolved gases in the magma,
oThe injection of a new batch of magma into an already filled magma chamber.
oActive volcanoes have a recent history of eruptions; they are likely to erupt again.
oDormant volcanoes have not erupted for a very long time but may erupt at a future time.
oExtinct volcanoes are not expected to erupt in the future.
oShield Volcanoes: Low explosivity, basaltic flow. eg- Hawaii volcano
oComposite: They are usually tall with steep even sides and are made out of repeating layers of lava flows. more viscous and cooler lava than basalt, sometimes called stratovolcanoes. eg: Mount Fuji in Japan.
oCaldera: these are most explosive volcanoes, collapses when erupt.
oCircum pacific ring of fire- Most of the volcanoes of earth, active subduction of pacific, Nazca cocos, jaun-de-fuca plate.
oMid Atlantic belt - Along mid Atlantic ridge.
oMid Continental belt- It includes volcanoes of the Alpine mountains and Mediterranean sea.
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