Plate Tectonics and Volcanism

Plate Tectonics and Volcanism - Plate Tectonics and...

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Plate Tectonics and Volcanism 1. Earth Facts a. Age is 4.56 billion years b. Ocean volume seems not to have changed much in the last 600 million years; recycling of crust must be going on c. Plate tectonics only filly accepted in the last 30 years, was suggested over 150 years ago d. Alfred Wegener Developed the modern idea of plate tectonics 2. The Layered Earth a. Seismology i. The study of earthquake waves provides information 3. a. Volcanism is the manifestation of heat and mass transfer from the inner Earth to its crust, oceans and atmosphere 4. The shell of the earth a. Seven large and many small plates b. About 7 km (oceanic) to 70 km (continental) thick, move a few cm a year c. 3 general types of plate boundaries 5. Recognize plate motion a. Seafloor mapping reveals paired-belts of magnetic reversals b. Distributions of earthquakes c. Distributions of volcanoes d. Distributions of fossil and geological strata e. Hotspot Tracks i. Island chains that vary regularly in age suggest movement away
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This note was uploaded on 07/02/2009 for the course ESS 106 taught by Professor Bergantz during the Spring '09 term at University of Washington.

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Plate Tectonics and Volcanism - Plate Tectonics and...

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