Mod+2+-+Jeremy+H

= = =Dynamic Earth=


 * Magma rises and pushes the plates apart
 * These boundaries are sometimes called spreading centers
 * Most lie along the ocean floor and have rift valleys
 * Some more characteristics of divergent boundaries are mid-ocean ridges, earthquake activity at fracture zones along mid-ocean ridges, and volcanic activity
 * One example of a divergent boundary is the Mid-Atlantic Ridge, it was formed from the South American Plate and the African Plate

Convergent Bo **undaries**

 * A plate collides with or dives under another
 * These boundaries are sometimes called subduction boundaries
 * The Himalayas were created from a convergent boundary, the Indian Plate and the Eurasian Plate formed them

Ocean-Ocean Subduction (Convergent Boundary)

 * Some characteristics are deep-sea trenches, volcanic island arcs, and earthquake activity

Ocean-Continent Subduction (Convergent Boundary)

 * Some characteristics are deep-sea trench bordering continent, volcanoes along coast of continent, and earthquake activity

Continent-Continent Collision (Covergent Boundary)

 * Some characteristics are high continental mountain chains and earthquake activity

Transform Boundaries

 * Two plates grind against each other
 * One transform boundary occurs in California, where the North American Plate and the Pacific Plate are sliding past each other along the San Andreas Fault
 * They don't create mountains or valleys
 * The rate of movement along the San Andreas Fault may be as high as 5cm per year
 * One characteristic is earthquake activity



= = tein, Seth. "Plate Tectonics." //Plate Tectonics//. N.p., 2009. Web. 11 Nov. 2009. .

Spaulding, Nancy E., and Samuel N. Namowitz, eds. //Earth Science//. First Edition. Boston, Ma: McDougal Littell, 2005. Print. = =

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