Mod+5.6+-+Morgan+R

Dynamic Earth

Divergent Boundaries
 * Form when magma rises and pushes plates apart
 * Volcanoes and Mountains form along seam
 * Great River Valley in Africa formed when two plates pulled apart
 * Cause sea floor spreading and Volcanic activity.



Convergent Boundaries
 * Plates collide with or dive under each other
 * Forms mountain ranges
 * Most of time one dives under other
 * ex: Cascades Volcanoes, CA
 * Created by North American Plate and Jan de Fuca Plate
 * Forms deep sea trenches
 * Causes earthquake activity
 * Subduction Boundaries
 * When oceanic plate dives beneath another plate
 * Collision Boundaries
 * Two plates containing continents collide and weld into a larger continent



Transform Boundaries
 * Two plates grind against each other
 * Causes earthquakes
 * One example is San Andreas Fault, CA, which moves about 5 cm a year.
 * Created by North American Plate and Pacific Plate



Citations

"Plate Tectonics." //National Geographic//. National Geographic, Web. 9 Nov. 2009. .

"Plate Tectonics Map." //Geology.com//. N.p., Web. 9 Nov. 2009. .