Volcanoes

 Volcano Vocabulary  volcano  magma  lava  Ring of Fire  magma chamber  pipe  vent  lava flow  crater  dormant  extinct  caldera  cinder cone  composite volcano  shield volcano

 Volcanoes and Plate Tectonics The Ring of Fire The Ring of Fire is a belt of volcanoes that circles the Pacific Ocean. As with most of Earth’s volcanoes, these volcanoes form along boundaries of tectonic plates.

 Volcanoes and Plate Tectonics Volcanoes and Converging Boundaries Volcanoes often form where two plates collide.

 Volcanoes and Plate Tectonics Hot Spot The Hawaiian Islands have formed one by one as the Pacific plate drifts slowly over a hot spot. This process has taken millions of years.

 Volcanic Eruptions Inside a Volcano A volcano is made up of many different parts.

 Volcanic Eruptions Magma Composition Magma varies in composition. It is classified according to the amount of silica it contains. The less silica that the magma contains, the more easily it flows.

 Volcanic Eruptions Cascade Volcanoes The Cascade volcanoes have formed as the Juan de Fuca plate sinks beneath the North American plate.

 Volcanic Eruptions Magma at Mount Rainier

 Volcanic Eruptions Mt. Rainier Mount Rainier is part of the Cascade volcanoes. All past eruptions of Mount Rainier have included ash and lava.

 How a Caldera Forms A caldera is a hole left when a volcano collapses. What is happening in the sequence of diagrams? Volcanic Landforms

 Volcanic Mountains Lava from volcanoes cools and hardens to form lava plateaus and three types of mountains.

 Volcanic Landforms Use the graphic organizer to compare and contrast two types of volcanoes.

 Volcanic Landforms Volcanic Necks, Dikes, and Sills Magma that cools and hardens into rock before reaching the surface forms volcanic necks, dikes, and sills.

 Volcanic Landforms Batholiths Batholiths are common in the western United States.