Mod+1+-+Joshua+H

**Magma rises and pushes** **plates apart.**
 * Divergent Boundary **

In the oceans, magma from deep in the earth's mantle rises toward the surface and pushes apart two or more plates. The process renews the ocean floor and widens the giant basins. Mountains and volcanoes rise along the seam. The Mid- ocean ridge system is the largest single volcanic feature on the earth. On land, giant troughs such as the great Rift Valley in Africa form where plates are tugged apart. East African rift in Kenya, Ethiopia and the Grande rift in New Mexico are exapmles of Divergent boundary.

** Convergent Boundary ** **A plate collide with or dives under another.** Andes Mountain Range is an example of Convergent boundary. The Nazca plate is moving under the South American plate, causing mountains to form and grow. Mt. Everest is another example of Convergent boundary. Indian and Asia plates collide and fold into mountains. India and Asia crashed 55 million years ago, slowly giving rise to the Himalaya.



**

Transform Boundary ** ** Two plates grind against each other. **

80% of the planets earthquakes occur along the rim of the pacific ocean, "Ring of Fire" The San Andreas Fault in California is an example of transform boundries. Transform boundries is when plates grind past each other.These Boundries do not create oceans or mountains but they often cause, like the one in San Fransico in 1906. The San Andreas fault in California is an example. The Atlantic and Pacific plates are colliding to form the fault.

//http://science.nationalgeographic.com/science/earth/the-dynamic-earth/plate-tectonics-article.htm//. 10 Nov. 2009. Web. 1 Jan

//http://earthquake.usgs.gov///. 10 Nov. 2009. Web. 1 Jan.

//http://www.himalayamountains.com///. 10 Nov. 2009. Web. 1 Jan.