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Dynamic Earth

__Convergent Boundaries-__ Convergent boundaries sometimes form when one plate dives under the other. One sub type of a convergent boundary is subduction. In ocean to ocean convergences a trench forms. During the process of a convergent boundary the sea floor spreads. There are many characteristic features in a convergent boundary. A few chacteristics of convergent boundaries are mid-ocean ridges, rift valleys, and volcanic activity. There are many examples of convergent boundaries. One example is the Indian Plate and the Eurasian Plate. Another example is the Juan de Fuca Plate and the North American Plate. Also there is the Cocos Plate and the North American. When the plates move one plate dives under the other.



__Divergent boundries-__ Divergent in the oceans, magma deep in Earth's mantle rises toward the surface and pushes two or more plates. This is the formation of a divergent boundary. Mountians and volcanoes rise to the seam. When rifting occurs ocean basins form. A couple characteristic features are deep-sea trenches, earthquake activity, and high continental mountian chains. Two sub types are subduction and collision. One example is the Mid-Atlantic Ridge. The two plates that make it up are the South American Plate and the African Plate. Another example has two plates and they are the Australian Plate and the Antarctic Plate. My last example also has two plates and they are the North American Plate and the Eurasian Plate.

__Transform Boundary-__ Transform boundaries form when two plates grind past eachother. When this happens it is called a strike-slip fault. This often results in an earthquake. One example of a transform boundary is St. Andreas Fault. Another example is the North Anatolian Fault in Turkey. My last example is the many fracture zones along the Mid-Ocean Ridge. One characteristic feature of a transform boundary is earthquake activity.



__Citations-__ "Plate Techtontics." //National Geographic//. Web. 7 Nov. 2009. [].

"Divergent Plate Boundaries." //geology.com//. Web. 7 Nov. 2009. [].

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