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Destructive margins
· Destructive margins are those at which two
tectonic plates move towards each other, or
· This can occur between two continental
plates, a continental and an oceanic plate, or
two oceanic plates.…read more

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Oceanic >< Continental
· When an oceanic plate meets a continental plate
it is forced underneath, or subducted, due to its
higher density compared with continental crust.
· There is intense friction created between the
plates during subduction, resulting in locking and
periodic energy release, or earthquakes.
· The force of the converging plates also buckles the
continental crust up into young fold mountains.…read more

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Oceanic >< Continental
· The area at which the oceanic plate is forced
under the continental one often becomes a Ocean
Trench, as the continental plate is partially
dragged under, such as the Philippine Trench.
· Melting oceanic crust in the Benioff Zone may rise,
resulting in volcanoes within the young fold
mountain range. An example is Mt St Helens in
the Cascade Range, USA.…read more

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Oceanic >< Oceanic
· When two oceanic plates meet there is little
subduction, as there is little density difference.
Volcanoes are commonly formed, being
submarine at fist, growing into islands over time.
· These islands often form in curved lines along the
subduction boundary, called Island Arcs. A good
example is the Aleutian Islands in the Pacific.
· The ocean trenches formed here are already deep
below the ocean, so they are known as Deep
Ocean Trenches, such as the Mariana Trench,
which is 11km deep.…read more

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Continental >< Continental
· When two continental plates meet subduction
does not occur due to the similar densities of
crust. Instead, collision occurs.
· An example of this is Indian Subcontinent, which
was forced northeast into the Eurasian Plate by
continental drift. The force of this collision
buckled and folded the plates upwards into the
Himalayan Mountains, which are still growing.
· This area has intense seismic activity, due to the
buckling of the rock. This caused earthquakes such
as the one in Sichuan in 2008.…read more


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