essay 3 convergent boundaries

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the size of the earth has not changed over the past 600m years this means crust is being destroyed at the same rate it is being created

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at convergent plate boundaries plates collide, called boundaries of construction. Part of the lityosphere is forced downwards while part of it is forced upwards creating mountains

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when 2 plates collide the heavier plate gets pulled downwards along the beinoff zone beneath the other this process is called subduction.Subduction zone is the point at which subduction occurs,subduction is aided by slab pull-the sinking plate pulls the rest of it with it

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when two oceanic plates collide e.g the fast moving pacific and slower moving pacific plate the heavier plate is subducted under the other

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the collision destroys crust forming a long deep narrow oceanic trench

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mariana trench formed where the pacific plate collided with the philippines plate,the challenger deep at the southern end of the mariana trech plunges deeper into the earth than mt everest.The mariana trench is 11km deep

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ocean on ocean diagram

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when a oceanic plate collides with a continental plate the heavier oceanic plate collides with the lighter continental and the oceanic plate is subducted beneath the continetnal the continental plate buckles and deforms

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the collision forms volcanic mountains.The andes were formed when the nazca plate collided with the south american plate and the nazca subducted under it

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the point of subduction is marked by the peru-chile trench which is 8.25km deep.Strong earthquakes and the uplift of mountains are common in this region.The most powerful earthquake ever was recorded in the andes in 1960

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oceanic to continental diagram

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when two continental plates collide theres no subduction as they are of similar density so they buckle up forming fold mountains

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when the indian plate and the eurasian plate collided 50m ago the himilayas were formed.The himlayas lay under the sea but were forced upwards due to collision

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the fold mountains of ireland,scotland,scandanvia were formed when 2 continental plates collided

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continental to continental diagram