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The Theory of Plate Tectonics Chapter 9, Section 5 • A geological theory stating that pieces of Earth’s lithosphere are in constant, slow motion. • As plates move they crash together, pull apart and grind past each other. Each movement along a plate boundary creates a different land feature. Plate Boundaries Transform Boundaries • Two plates slip by each other • Crust is not created or destroyed • Earthquakes occur often What drives the plates? Plate Boundaries Divergent Boundaries • Plates move away from each other • Found in the oceanic and continental crust • Creates rift valleys • The mid-ocean ridge is a D.B. Plate Boundaries Convergent Boundaries •Plates come together, collide, crash! •3 things can happen depending on the type of crust that is colliding. 1 - Oceanic to Oceanic – the more dense plate will subduct (go under the other). 2 - Oceanic to Continental – the more dense oceanic crust subducts (goes under) http://www.wwnorton.com/college/geo/egeo/animations/ch2.htm 3 - Continental to Continental – builds mountains Plate Boundaries Demo• http://www.wwnorton.com/college/geo/ egeo/animations/ch2.htm • Subduction http://oceanexplorer.noaa.gov/explorati ons/03fire/logs/subduction_320.mov
