1. Michelle Cullen macullen@adelphia.net 1 Michelle Cullen Computer-Assisted Language Learning GED 565 B Saint Michael’s College Summer 2006

2. Michelle Cullen macullen@adelphia.net 2 When you hear the words “plate tectonics” what comes to your mind?

3. Michelle Cullen macullen@adelphia.net 3 Continents Oceans Crust Movement Volcanoes Earthquakes Here are some of the things that come to my mind:

4. Michelle Cullen macullen@adelphia.net 4 Divergent Plate Movement Examples: Atlantic Ocean, East African Rift, Mid-Atlantic RidgeMid-Atlantic Ridge 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

5. Michelle Cullen macullen@adelphia.net 5 Convergent Plate Movement http://pubs.usgs.gov/gip/dynamic/understanding.html#anc hor6715825 Oceanic crust collides and slides beneath the continental crust. Volcanoes can form. Deep trenches can form in the ocean. Examples: Cascade Mountain Range, Mount Saint Helens, and AndesAndes

6. Michelle Cullen macullen@adelphia.net 6 Transform Plate Movement http://pubs.usgs.gov/gip/dynamic /understanding.html#anchor6715 825 Examples: San Andreas Fault, Blanco Fault, Mendocino Fault, Murray Fault, and Molokai FaultSan Andreas Fault Plates slide past each other. Movement usually occurs on the ocean floor. Earthquakes can occur when friction and pressure build up.

7. Michelle Cullen macullen@adelphia.net 7 Location of Earthquakes and Volcanoes http://hsv.com/scitech/earthsci/quake.htm

8. Michelle Cullen macullen@adelphia.net 8 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.

9. Michelle Cullen macullen@adelphia.net 9 References Convergence of plates [This Dynamic Earth, USGS] RConvergence of plates [This Dynamic Earth, USGS] Microsoft ClipArt San Andreas fault [This Dynamic Earth, USGS] Spreading Plate Boundaries Understanding plate motions [This Dynamic Earth, USGS] Retrieved on June 12, 2006.Understanding plate motions [This Dynamic Earth, USGS] Virtual Times: Recent Earthquakes and Volcanoes Retrieved on May 18, 2006Virtual Times: Recent Earthquakes and Volcanoes