Explanation:

Volcanic mountains are very common along the destructive plate boundaries i.e. Oceaniccontinental plate boundaries which are yet uncovered in the rock folded mountains formed due to continental –to continental plate collision. The Himalayas are also a plate-to-plate collision tectonic boundary. In this case, the Indian Plate [of the Indian Subcontinent] is colliding head-on with the Eurasian Plate. Both plates are comprised of continental lithospheric crust, so there is no appreciable distinction in density.