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VOLCANO Holly Johnston 1 Introduction • Volcanoes are cone shaped mountains that are created when magma breaks through the Earth’s surface. Holly Johnston 2 Stages of Volcanic Activity • Eruption Stage • Cooling and Inactive Stage • Volcanic activity can range from permanently active to inactive. Holly Johnston 3 Types of Volcanoes • • • • Three main types of volcanoes are: Cinder Cone Shield Composite Holly Johnston 4 Types of Lava Rocks • There are two main types of lava rocks • Basalt • Obsidian Holly Johnston 5 Conclusion • While volcanoes can be explosive and destructive, they are a natural occurrence that should be appreciated and studied • Volcanoes begin by magma erupting through the Earth’s crust. Holly Johnston 6