Mod+7.8+-+Emily+H

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at divergent boundaries in the oceans, magma from deep in the Earth's mantel rises toward the surface and pushes apart two or more plates. Mountains and volcanos rise along the steam. The process renews the ocean floors and widens the giant basins. A single mid-ocean ridge the longest mountain range in the world.======

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On land giant troughs such as the Great Rift Valley in africa from where plates are tugged apart. If the plates there continue to diverge, millions of years from now eastern africa will split from the continent to form a new land mass. A mid-ocean ridge wold mark the boundary between the plate======

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Where plates serving land mass collide, the crust crumbles and buckles into mountain ranges. India and asia crashed about 55 million years ago, slowly giving rise to the mountain system of the himalayas the highest point on earth. As they mash up continues, the mountains get higher. Mount everest, the highest point on earth, maybe a little bit taller tomorrow than it is today.======

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These convergent boundaries also occur where a plate of ocean dives,in a process called subdontion,under a land mass. As the overlying lift up, it also forms mountain ranges. in addition, the dividing plate melts and it often spewed out in volcanos erupting such as those that formed. some of the mountains in the andres pf south america.======

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an ocean-ocean convergences,one plate usually dives beneath the others, forming deep trenches like the mariana trench in the north pacific ocean. the deepest point on earth. These types of colisions can also lead to underwater volcanos that eventually build up.======

= = =T__ransform boundary__ = the san Andreas Fault california is an example of a transform boundary, where two plates glide past each other wlong what are called strike-slip faults. These bounderies don't procede spectacular features like mountains or oceans, but the halting motion often triggers large earthquakes such as the 1906 one that devasted San Francisco.