Mod+7.8+-+Alec+S

Dynamic Earth
 * convergent boundaries are when two plates collide.
 * 1) If this occurs in the ocean the one plate dives under the other in a process called subduction which creates deep ocean trenches such as the Mariana trench which contains challenger deep which is thought to be the deepest spot bellow sea level in the world at 35,761 feet deep. This also forms Island chains by
 * 2) when this occurs on the coast the land mass is pushed up and creates deep trenches at the continental divide and causes volcano mountain chains to appear. Mount Sashta is a volcano that has formed near a subduction boundary near California.
 * 3) When the process occurs on land mountain ranges are created like the Hymalaya's which contains the legendary Mount Everest [[image:convergent2.jpg width="353" height="156"]]
 * Divergent boundaries are when plates spread apart
 * 1) Most of the divergent boundaries occur in the ocean when this occurs a rift valley forms such as the mid-Atlantic Ridge which is a divergent boundary