Mod+5.6+-+Heather+B

Dynamic Earth

__Divergent boundaries- Magma rises and pushes plates apart.__
 * Divergent boundaries in the oceans magma from deep in the earths mantle rises toward the surface and pushes apart two or more plates.
 * The process recreates the ocean floor, widens the giant basins.
 * Two examples of this boundary is the mid-Atlantic Ridge
 * Also the East Pacific Rise.



__Convergent Boundaries-__ A plate collides with or dives under another
 * These boundaries occur where a plate of ocean dives, in a process called subduction.
 * When the overlying plate lifts up, also forms mountain ranges.
 * Effects that are found at this type of plate include a zone of progressively deeper earthquakes, an oceanic trench, a chain of volcanic islands.
 * Himalayas, western coast of south America



__Transform boundaries__ - Two plates grind against each other.
 * San Andreas fault in California is an example of this boundary
 * Halting motion often trigger large earthquake
 * Western North America is another example



Citations- http://science.nationalgeographic.com/science/earth/the-dynamic-earth/plate-tectonics-article.html 11-10-09

http://geology.com/ 11-10-09