1. Introduction to Volcanology November 2009

5. Volcano Mount Saint Helen Eruption, May 18th 1980

6. Magma chamber conduit mantle Parasitic Cone Ash Cloud/Gases Vent Lava Flow Crater Parts of a Volcano

7. “ Ring of Fire” Volcanic arcs and oceanic trenches partly encircling the Pacific Basin form the so-called , a zone of frequent earthquakes and volcanic eruptions.