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Tag «lava cones»

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 …