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Understanding Volcanoes: Formation, Causes, and Prediction | GeoStudy Guide

Explore the causes of volcanic eruptions, from magma formation to tectonic plate boundaries. Learn how to predict eruptions and classify volcanoes.

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Understanding Volcanoes: Formation, Causes, and Prediction | GeoStudy Guide

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  1. What Causes Volcanoes? 11/13/13 • 9-3 pgs. 230-235 IN: What causes volcanoes?

  2. Inside a Volcano

  3. Formation of Magma • Solid rock may become magma when: • pressure is released, • when the temperature rises above its melting point, • or when it composition changes.

  4. Where do volcanoes form? Near tectonic plate boundaries.

  5. Where do volcanoes form? • When tectonic plates separate. +Rift – deep crack between plates

  6. http://www.wwnorton.com/college/geo/egeo/flash/2_11.swf

  7. Where do volcanoes form? • When tectonic plates collide. +Subduction Zones

  8. http://www.wwnorton.com/college/geo/egeo/flash/2_9.swf

  9. Where do volcanoes form? • Hot Spots – places on the Earth’s surface that are directly above columns of rising magma, called mantle plumes.

  10. Hawaii

  11. http://www.wwnorton.com/college/geo/egeo/flash/2_10.swf

  12. Predicting Volcanic Eruptions • Measuring Small Quakes • Measuring Slope • Measuring Volcanic Gases • Measuring Temperature

  13. Classifying Volcanoes • Extinct – will never erupt • Dormant – may erupt • Active – are erupting

  14. OUT: Why are most volcanoes on tectonic plate boundaries?

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