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Transcript
Convection Currents and HOT SPOTS Convection Current • the hot mantle deep in Earth moves: hot rock expands, decreasing its density and begins to rise; • Colder and/or denser rock sinks • this causes the rigid tectonic plates on the surface to move and cools the deep interior of the planet • Convection also happens in the outer core, which also helps to cool the core and generate the Earth’s magnetic field. • http://www.youtube.com/watch?v=ryrXAG Y1dmE&feature=related • http://www.pbslearningmedia.org/resource/ nvdv.sci.earth.yellowvolc-1/volcanism-atyellowstone/ 5:45 min • http://www.pbslearningmedia.org/resource/ ess05.sci.ess.earthsys.hawaii/platetectonics-the-hawai699ian-archipelago/ - hotspot (4:36) Problems with Theory • HOT SPOTS • Not associated with plate boundaries • Plates move over areas of rising magma (Mantle thermal plumes) • Can infer direction of plate movement • Older volcanoes the farther you are from hot spot