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= = = Convergent Boundaries =

Definition-Convergent boundaries are plates that serve land-masses collide, the crust crumbles and buckles into mountain ranges. They occur where a plate of ocean dives,in a process called subduction under a land-mass. Diving plates-melts and is often spewed out in a volcanic eruptions. Created by tectonic plates pushing against each other and the only direction for these earth to move up. Destruction of the earths crust takes place along the convergent boundaries where plates are moving toward each other, and sometimes one plates sinks under one another. Can occur between two largely oceanic plates between two largely continental plates.

Examples: 30-50 million years ago in different stages the Indian plate has collided with the Eurasian Continental Plate to form the Himalayas Mountains.



55 million years ago the Indian and Asia Plates collided together made Mount Everest. The Nasca Plate and South America Plate are convergent plates to make that Andes Mountains.

 = Divergent Boundaries =

A mid ocean ridge would then mark the boundary between that plates. Where the plates come apart they are called divergent boundaries. In the oceans, magma cools from deep in the earths mantle rises toward the surfaces and pushes apart two or more plates. Mountains and volcanoes rise along that seam.



Examples: The East African rift in Kenya and Ethiopia and he Rio Grande rift in New Mexico.

The mid Atlantic ridge is the best known divergent boundary, it extends from the Arctic ocean to beyond the southern tip of Africa. The Great River Valley form by the African plate and Somali plate are constantly being tugged apart.

= Transform Boundaries = Places were plates slide pat each other are called transform boundaries. The sliding motions cause lots of earth quakes. Since plates on ether side of a transform boundaries are merely sliding past each other and not tearing or crunching each other, transform boundaries lack the spectacular features found at convergent and divergent boundaries.

The North American Plate and the Pacific Plate rube together to make the San Andrea's fault in California. The Pacific Plate and the other plates around it rube against to make the ring of fire in the Pacific ocean. The Australian and the Pacific plate rube together in the middle of the ocean to make an earthquake vibrations.

= Citations: = = = -"Plate Tectonics." National Geographic. Web. 17 Nov. 2009. . - "Earthquakes." National Geographic. Web. 18 Nov. 2009. . -"Volcanoes." National Geographic. Web. 18 Nov. 2009. . -Plate Tectonics. Web. 18 Nov. 2009. . - Himalaya Mountains. Web. 18 Nov. 2009. . -sharonyau1995,. // Convergent Boundaries //. 2009. // Flickr //. Web. 3 Nov. 2009. <  [] >. - Sharonyau1995,. // Divergent Boundaries //. 2009. // Flickr //. Web. 3 Nov. 2009. <  [] >. -elosoenpersona,. // Machapuchare Summit (6.993m), Nepal //. 2007. // Flickr //. Web. 3 Nov. 2009. <  [] >. -Degginger, Phil. // San Andreas Fault //. 2009. National Geographic Society. // National Geographic //. Web. 3 Nov. 2009. <  [] >. - // A Continental-Ocean Transform Boundary //. 1999. // Transform Margins //. Web. 4 Nov. 2009. <  [] >. -Harel, Jonathan. // Passage. // 2007. // Flicker, // Web. 3 Nov. 2009.  [] [|arabianplate1.jpg] Descloitres, Jacques. // Persian Gulf Plates //. 2009. National Geographic Society. // National Geographic //. Web. 3 Nov. 2009. <  [] >.   = =



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