004-Plate Tectonics - lithosphere asthenosphere mesosphere...

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asthenosphere lithosphere mesosphere
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Lithosphere (hard) Asthenosphere (soft) Mesosphere
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Mantle - 1000 o C mesosphere • Solid • ~ 2300 km thick asthenosphere • Soft • ~3000 km thick lithosphere • hard • ~100 km thick Inner Core- 4300 o C • mostly iron core • inner part is so compressed that it is solid Outer Core- 3700 o C • iron and sulfur • liquid Crust • floats on top of lithosphere continental crust (granite) • 20 to 70 km thick oceanic crust (basalt) • ~ 8 km thick Earth formed 4.6 bya
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Principles of plate tectonics • The Earth is composed of a mosaic of thin rigid plates (pieces of lithosphere) that move horizontally with respect to one another • Plates interact with each other along their plate boundaries • Plate boundaries associated with tectonic activity (mountain building, earthquakes, active volcanoes)
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Alfred Wegener • Proposed Theory of Continental Drift (1915) • Failed to provide a mechanism
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• continental shape
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This note was uploaded on 04/29/2011 for the course OCN 201 taught by Professor Decarlo,e during the Summer '08 term at University of Hawaii, Manoa.

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004-Plate Tectonics - lithosphere asthenosphere mesosphere...

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