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Volcanoes and Volcanic Landforms

Geography Notes for UPSC

A volcano is a place where gases, ashes and/or molten rock material — lava — escape to the ground.

The mantle contains a weaker zone called asthenosphere.

The material in the upper mantle(asthenosphere ) portion is called magma.

Once it starts moving towards the crust or it reaches the surface, it is referred to as lava.

The material that reaches the ground includes lava flows, pyroclastic debris, volcanic bombs, ash and dust and gases such as ninogen compounds, sulphur compounds and minor amounts of chlorene, hydrogen and argon.

Volcanoes are classified on the basis of nature of eruption and the form developed at the surface. Major types of volcanoes are as follows:

Shield Volcanoes

Composite Volcanoes

Mid-Ocean Ridee Volcanoes

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