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Dynamic Earth

Plate tectonics-is a theory that describes the formation, interaction, and and movements of the plates

Transform boundaries Convergant Boundaries Divergant Boundaries
 * An example of a transform boundary is the San Andreas Fault.
 * A transform boundary is when two Plates grind across each other called the strike and slip fault.
 * Transform boundaries halting motion is what causes the the earthquake effect.
 * The plates that caused the San Andreas fault are the Pacific Plate and the North American Plate
 * An Example of a Convergant Boundary is Marina Trench.
 * Convergant boundaries are when plates run into each other and one of the plate goes down and the other goes up.
 * The deepest parts of the earth are caused by these boundaries
 * An example of a Convergant plate when its under a huge landmass the top plate pushes up creating mountain ranges and the diving plate creates a volcano this process is called Collision Boundaries
 * An example of a mountain that was created this way is Mt.Shasta
 * As the Pacific Plate subducts under the Philippine plate to form the Marina Trench this is called Subduction
 * Are plates that move away from each other
 * An example would be a great rift valley and a mid ocean rift like like Iceland
 * Most Mid ocean ridges are underwater so u can understand why most volcanos are formed underwater
 * And some underwater volcanos are very dangrous like when in Iceland in 1783 The volcano erupted killing 10,000 people also crops and cattle frohe ash and from piosnous gas to.

Citations:Stein, Seth ,National Geographic Plate tectonics, National Geographic, 11/11/09, http://science.nationalgeographic.com/science/earth/the-dynamic-earth/plate-tectonics-article.html

Littel, Mcdougal, Earth Science ,Spaulding namowitz, 11/10/09