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 * Dynamic Earth**


 * The three types of boundaries are**:

One type of plate boundary is Divergent and occurs when magma rises and pushes the plates apart. Divergent Boundaries are found in the oceans, occurs when the magma from deep in the earth's mantle rises towards the earths surface and pushes apart two or more plates, Mountains, and volcanoes rise along the seam. this process renews the ocean floor and widens the giant basins. A single mid-ocean ridge system connects the world's ocean floor and widens the basins. A single mid-ocean ridge system connects the world's oceans, making the ridge the worlds longest mountain range in the world.



The second type of plate boundary is convergent and occurs when a plate makes contact with or dives under another plate. when convergent boundaries occur they can form mountains such as the Himalayas and Mount. Everest. convergent boundaries can also occur where a plate of ocean dives, which is a process called subduction, under a landmass. The over lying plates lifts up to form mountain Ranges and the diving plate melts then spews out in a volcanic eruption like the ones that formed the mountains in Andes located in south America. The convergent boundaries that occurs where plates of ocean dives which can cause trenches similar to the Mariana trench located in the North Pacific Ocean, and is the deepest part on earth. Plus they can form under water volcanoes that eventually build into island arches sort of like Japan.



The third type of plate boundary is transform and occurs when two plates grind against each other. The San Andreas fault in california is an example of a transform boundary, because as the two plates grind past each other along what are called strike-slid faults and can often cause large earth quakes, such as the 1906 earth quake that devastated san francisco.