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Plate Boundaries

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by

Mea Riley

on 11 May 2016

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Transcript of Plate Boundaries

Plate Boundaries
Spreading Plates
Spreading Plates is also known as Diverging Plates. This is where magma spills out of the mantle and onto the earths surface this forms the ridge of a volcano. An excellent example is the Mid-Atlantic Ridge.
Colliding Plates
The edges of some plates move towards each other. Plates that collide with each other are called converging plates. If one plate is made from oceanic
crust and the other plate is continental crust, the edge of the oceanic plate sinks under the lighter continental plate. The areas where this happens are called subduction zones. Deep ocean trenches form along subduction zones. When plates sink under each other, huge amounts of heat and friction are produced. The heat and friction result in earthquakes and volcanic activity.

Sliding Plates
California, in North America, experiences many earthquakes. The earthquakes there are caused by the edges of two plates sliding past each other. The plates
do not slide smoothly; they get jammed together and the pressure builds up. Suddenly, the plates jolt past each other and start sliding again.


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