This document provides information about different types of volcanoes through examples of famous volcanoes around the world. It discusses how volcanoes work internally and the three main types: active, dormant and extinct. Examples discussed include Vesuvius and the buried city of Pompeii, underwater volcanoes making up two thirds of the world's total, and Mount St. Helens whose 1980 eruption caused its height to decrease by 400 meters. Famous volcanoes Krakatoa, Teide, and Etna are also summarized briefly.