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In this textbook chapter, students are introduced to the study of tectonics through an exploration of the 1980 eruption of Mt. St. Helens, including an interview with geomorphologist Dr. Danny Vaughn, Indiana State University. The flow of energy, convection, in the Earth's mantle is discussed and connected to earthquakes, volcanic eruptions and the movement of the Earth’s plates. The resource includes links to current news articles, and a suite of pre and post unit assessments. A teacher's guide supports classroom use. This is the second chapter in the unit, Energy Flow, exploring the energy transfer through the atmosphere, oceans, land, and living things over short and long timescales. The resource is part of Global System Science (GSS), an interdisciplinary course for high school students that emphasizes how scientists from a wide variety of fields work together to understand significant problems of global impact.