Plate Tectonics

Plate Tectonics - Matching shapes? Chapter 11 The Dynamic...

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1 Chapter 11 The Dynamic Planet Plate Tectonics (Tectonic Cycle) Matching shapes? Jigsaw Puzzle Jigsaw Puzzle Jigsaw Puzzle – The continental pieces indeed once were fitted together! Breakup of Pangaea
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2 Plate Tectonics The continents adrift Lithosphere is less dense than the upper mantle, the asthenosphere, and the rest of the mantle that is active and in motion Æ migrates The arrangement of continents and oceans we see today is not permanent but is in a continuing state of change! Plate Tectonics The continents adrift Rigid layer: plates Plates are adrift because of convection currents Mantle flow transfers the heat to the surface where it is lost through volcanic action Similar to a heated saucepan Plate tectonics (tectonic cycle) theory is the framework we see and understand most geomorphic processes today Plate tectonics approach is clearly a “ process-response model Plate tectonics (tectonic cycle) processes Upwelling of magma Earthquake activity Volcanic activity Folding (Warping) Faulting (Shearing) Plate Tectonics Tectonic Plates ~ 14 plates: Both oceanic and continental Continuous slow motion (~6 cm/yr)
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This note was uploaded on 03/25/2008 for the course GEOG 203 taught by Professor Guneralph during the Spring '08 term at Texas A&M.

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Plate Tectonics - Matching shapes? Chapter 11 The Dynamic...

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