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Michelle Cullen Computer-Assisted Language Learning GED 565 B Saint Michael’s College Summer 2006 Michelle Cullen [email protected] 1 When you hear the words “plate tectonics” what comes to your mind? Michelle Cullen [email protected] 2 Here are some of the things that come to my mind: •Continents •Oceans •Crust •Movement •Volcanoes •Earthquakes Michelle Cullen [email protected] 3 Divergent Plate Movement •Two plates move apart. •Magma rises and forms new crust. This creates seafloor spreading. •Creates ridges in the ocean. http://pubs.usgs.gov/gip/dynamic/understandi ng.html#anchor6715825 Examples: Atlantic Ocean, East African Rift, Mid-Atlantic Ridge Michelle Cullen [email protected] 4 Convergent Plate Movement •Oceanic crust collides and slides beneath the continental crust. •Volcanoes can form. •Deep trenches can form in the ocean. http://pubs.usgs.gov/gip/dynamic/understanding.html#anc hor6715825 Examples: Cascade Mountain Range, Mount Saint Helens, and Andes Michelle Cullen [email protected] 5 Transform Plate Movement •Plates slide past each other. •Movement usually occurs on the ocean floor. •Earthquakes can occur when friction and pressure build up. Examples: San Andreas Fault, Blanco Fault, Mendocino Fault, Murray Fault, and Molokai Fault http://pubs.usgs.gov/gip/dynamic /understanding.html#anchor6715 825 Michelle Cullen [email protected] 6 Location of Earthquakes and Volcanoes http://hsv.com/scitech/earthsci/quake.htm Michelle Cullen [email protected] 7 How are the location of the plates relate to the location of earthquakes and volcanoes? •Most of the volcanoes and earthquakes occur at the edges of the plates. Michelle Cullen [email protected] 8 References • • • • • Convergence of plates [This Dynamic Earth, USGS] R Microsoft ClipArt San Andreas fault [This Dynamic Earth, USGS] Spreading Plate Boundaries Understanding plate motions [This Dynamic Earth, USGS] Retrieved on June 12, 2006. • Virtual Times: Recent Earthquakes and Volcanoes Retrieved on May 18, 2006 Michelle Cullen [email protected] 9
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