Mode of Formation of Volcanic Mountains
A volcanic mountain is formed through a volcanic eruption which is a forceful ejection of molten materials from the earth's crust. The ejected materials gradually build up to form a mountain. A volcanic mountain can be either violent or mild. A volcanic mountain may consist of alternating layers of ash and lava or mainly of lava. Volcanoes which consist of alternating layers of lava and ash are said to be composite, while those that are made up almost exclusively of lava are called lava cones.
There are two types of lava cones. Acid lava which is stiff and viscous has a gig silica content and flows slowly, while basic lava is more fluid and has more sodium, calcium and magnesium. It also flows more rapidly and travels much further before hardening than acid lava. This is the formation of volcanic mountains.