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Plate Tectonics An original Power Point presentation by Lindsey Durham Plate Tectonics • The crust of the Earth is not an unbroken shell but is made of plates (slabs of rock) that move. Plate Tectonics • Continental Drift – The plates are still moving today • 4 inches/year Plate Tectonics • 3 Types of Plate Movements – Divergent – Convergent – Transform Plate Tectonics • Divergent plates – Occurs when 2 oceanic plates move apart. – Magma from the mantle rises through the new crack. – The magma cools and new ocean floor is created. – This is called sea floor spreading. Plate Tectonics • Convergent Plates • 2 plates push against each other. – 3 types • 2 Continental plates • 1 Continental and 1 Oceanic • 2 Oceanic plates Plate Tectonics • 2 Continental – The 2 plates push against each other making folds which create mountains. Plate Tectonics • 1 Continental and 1 Oceanic – Subduction occurs • The oceanic plate slides under the continental plate because it is lighter. • The impact causes crack in which magma flows up through. • The cooled magma builds up creating volcanoes. Plate Tectonics • 2 Oceanic Plates – Subduction occurs and magma flows up the crack forming volcanoes. Plate Tectonics • Transform Plates – 2 plates slide against each other – Fault lines created • Cracks in the earth’s crust – When the plates move the cause earthquakes Plate Tectonics • Tsunamis – Underwater earthquakes that can cause HUGE waves.
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