Question

What is a Volcano? Mention its major components.

Answer 1

Sill - A flat piece of rock formed whenmagma hardens in a crack in a volcano. Vent - An opening in Earth's surface through which volcanic materials escape. Lava - Molten rock that erupts from a volcano that solidifies as it cools. Crater - Mouth of a volcano - surrounds a volcanic vent
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Answer 2

A volcano is a conical hill or mountain (volcanic  peak) built up by the ejection of  igneous materials from a vent.

The form of a  volcano is influenced by many factors, such  as the nature of the materials extruded (lava,  cinders or ash); the chemical composition of  the lava (acid lava, rich in silica and relatively  viscous, forms steep-sided, dome-like volcanoes;  basic lava containing little quartz, is  more mobile, giving rise to more gently  sloping volcanic cones); the extent to which  either powerful explosive activity or central  collapse has formed a large crater.

Some volcanoes form along a crack or fissure  in the Earth's crust. These are termed fissure  volcanoes and tend to lack the distinctive  individual Volcano's shape. Volcanoes are also  classified as active, dormant or extinct.