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Earthquakes and Volcanoes

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Plates on the MoveMantle Convection and Plate TectonicsComputer Model of Mantle ConvectionScience Bulletins: Mapping the Heat BeneathExploration Questions: Plate TectonicsAnswers to Exploration Questions: Plate Tectonics
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Volcanoes 101Volcanoes: Magma RisingMonitoring Mount Etna: Magma on the MoveFollow the MagmaScience Bulletins: Yellowstone—Monitoring the Fire BelowYellowstone National Park is a VolcanoScientists at Work: HawaiiExploration Questions: VolcanoesAnswers to Exploration Questions: Volcanoes
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Earthquakes 101How Are Earthquakes Measured?On Shaky Ground: Building a Safer Future in HaitiScience Bulletins: Tsunami Science—Reducing the RiskFrom Math to MapsScientists at Work: San Andreas FaultExploration Questions: EarthquakesAnswers to Exploration Questions: Earthquakes
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About this unit

Over millions of years, ocean basins open and close, continents move and change shape, and mountains are pushed up and eroded away. Such dynamic processes continually reshape the surface of the Earth. The movement of rigid plates on the Earth’s surface, known as plate tectonics, is the cause of these changes. Volcanic eruptions and earthquakes are dramatic hints of the great movements that take place over the vastness of geological time.