Plate Margins
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Aims:
To differentiate between plate margins.
Constructive margins
Destructive margins
Conservative margins
Location of real life (empirical) examples of each type of margin.
Resources
Waugh Chapter 16 page 262
Constructive plate margins
When two plates are moving away from each other
Magma flows upwards and spreads creating new areas of crustal material
In ocean areas this produces ocean ridges such as the mid Atlantic ridge
In continental areas this results in rifts e.g. East African rift valley
They are also known as divergent margins
Destructive Plate Margins
When two plates are converging or colliding
It leads to the destruction of plate material
Subduction zones occur when an oceanic plate subducts beneath another plate.
When two oceanic plate converge subduction produces a deep ocean trench and an island arc, a line of volcanic islands(Caribbean)
If the convergence involves an oceanic and a continental plate, the subduction produce a line of fold mountains along the edge of the overriding continental plate, e.g. the Andes
Collision plate Margins
When two plates of continental crust move together
Form fold mountains e.g. Himalayas
Conservative Plate Margins
Where two plates slide past on another
(California, Canaries Islands and Indonesia)
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by: Admin
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Word Count: 655
Date: Sun, 13 Feb 2011 Time: 4:35 PM
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