What part does volcanics

have to play in the formation of mountain ranges?

Basic Summary

All volcanoes form from materials from deep within the earth including enormous amounts of lava which pile up on the earth's surface, forming a mountain. Melted rock is called magma, and it collects into huge chambers beneath the Earth’s surface. The molten rock is less dense than the rock around it and so it “floats” upwards, through cracks and faults. When the magma finds its way to the surface, it explodes out as lava, rock, ash and volcanic gases; this is a volcanic mountain.