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Plate Tectonics Notes Notes http://vulcan.wr.usgs.gov/Imgs/Gif/PlateTectonics/Maps/map_plate_tectonics_world.gif Plate Tectonics • Theory of Plate Tectonics – • explains the way that continents separated into today’s land masses from Pangea • The study of plate movement and the features that they affect. http://www.pbs.org/wgbh/aso/tryit/tectonics/images/convectioncurrent.gif Major Plates The lithosphere is broken into 8 major plates • • • • • • • • Eurasian African Indo-Australian Pacific North American South American Antarctic Nazca Find the 7 Major Plates When plates move they cause: • Ocean basins – (anywhere on Earth covered by ocean water) • • • • Mountain Ranges Islands Volcanoes Earthquakes Ocean Basin 5 Major OceansPacific Ocean Atlantic Ocean Indian Ocean Southern Ocean Arctic Ocean All Ocean water What features do you think are formed at each of the following boundaries? http://www.belmont.sd62.bc.ca/teacher/geology12/photos/tectonics/Plate%20Boundaries.jp Types of Plate Boundaries http://www.n-d-a.org/images/tectonic-plate-boundaries.jpg Convergent Boundary • Subduction – When the denser plate slides under the less dense plate • Volcanoes and frequent earthquakes occur at the boundaries http://tasaclips.com/illustrations/Convergent_Boundary.jpg Convergent Boundary • Folded Mountains occur when 2 continental plates collide http://tasaclips.com/illustrations/Convergent_Boundary.jpg Divergent Boundary c • Plate move away from each other • Form ocean basins • Rift Valleys http://2.bp.blogspot.com/_ejqMoM1Uaa4/Sh6ZE5I2tiI/AAAAAAAAADU/7jMa6rVEIXU/s320/db.jpg Rift Valley formed Transform Boundary • Plates slide past one another • causes earthquakes • It doesn’t destroy or build Earth’s crust. • San Andreas Fault is an example of this boundary. http://www.nature.nps.gov/geology/usgsnps/pltec/SAtransform244x201.gif SAN ANDREAS FAULT Find the Plate Boundaries Seismic Activity