Volcano, is a mountain or hill which usually looks like a cone with a crater or vent through which lava, rock fragments, hot vapor, and gas are being erupted from the earth’s crust.
Volcanoes are form when hot material from below earth rises and leaks into the crust, this hot materials are called magma, which comes either from a melt of sub ducted crusted materials, and which is light and buoyant after melting, it can also come from the deeper in the interior of the planet and it is also light and buoyant because it is very hot.
The Magma, rising from the lower reaches, gathers in a reservoir, in a weak portion of the overlying rock called the Magma chamber. Eventually, but not always Magma erupts onto the surface, strong Earthquakes accompany rising magma, and the volcano cone may swell in appearance just before an eruption, when the magma pressure is getting bigger inside the shaper of the volcano will swell as these is an indication that there will be an eruption.
An active volcano can build itself in a few thousand years or longer, given that the highest stratovolcanoes are more than 22,000 feet high, the rate at which they can increase in height is impressive, most volcano build themselves from the top down, while material is ejected from the central vent or near the volcanic peak, and gravity brings it down the slopes. The process by which volcano builds its edifice depends on the type of volcano, for example stratovolcanoes and shield volcanoes builds form the top downwards, in contrast lava that flows form cinder cones is emitted from its sides or near its base while volcanic debris is transported onto the surrounding area through direct eruption, wind, water, and landslides from the flanks of the