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Volcanoes and their types

A volcano is a vent or fissure in the earth’s crust through which hot lava and volcanic gases are thrown out. Volcanic eruptions may be either explosive or quiet. The earth’s upper mantle (asthenosphere), under the crust, is nearly molten. Magma originates at this depth. They migrate upwards, often along faults. In a volcano, the …

Active, dormant and Extinct Volcanoes

Active Volcanoes: An active volcano may be defined as the one which is definitely known to have erupted periodically in historic times. Kilauea volcano on Hawaii is the world’s most active volcano, followed by Etna in Italy and Piton de la Fournaise on La RĂ©union island. Further ordering the value of the activity of volcanoes …