Discuss the processes involved in volcanism. Highlight the major volcanic regions in the world and their associated tectonic settings.

Volcanism refers to the phenomenon of magma escaping through vents onto surface. Processes involved: (1) Formation of volcanic outlet - for magma to force through (2) Formation of magma - deep in earths surface (3) Stage of magma requires - Compressive forces of subduction of oceanic plate under the continental plate (4) Formation of primary and secondary features - plutonic rocks. Major volcanic regions and tectonic settings: - Composite cone diagram showing pyroclastic flows, opening vents, plateau basalts, and basement (1) Formation of magma - deep in earths surface (2) Composite volcanoes require - Compressive forces of subduction of oceanic plate under the continental plate (3) Formation of primary and secondary features - plutonic rocks.