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Published byOliver Cross Modified over 8 years ago
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Intro Objective 10/15/12 Describe the three forces thought to move tectonic plates. Pick up worksheet from front table. Weekly Worksheet #8: What do you think causes tectonic plates to move?
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Causes of Plate Motion 3 causes of plate motion Convection Currents Ridge Push Slab Pull
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Causes of Plate Motion Ridge Push New magma pushes older rock at mid-ocean ridges
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Causes of Plate Motion Slab Pull Gravity pulls down the subducting plate back into the mantle
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Causes of Plate Motion Convection Currents Hot magma expands and rises Cool magma sinks Changes in density
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Causes of Plate Motion Mantle Plumes An upwelling of hot magma from the core Creates volcanic “hot spots” Example: – Hawaii – Yellowstone N.P., Wyoming
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Objective 10/15/12 Outro Describe the three forces thought to move tectonic plates. List two ways convection currents affect your life.
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