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This is a convergent plate boundary,
the plates move towards each other. The amount of crust on the surface
of the earth remains relatively constant. Therefore, when plates
diverge (separate) and form new crust in one area, the plates must
converge (come together) in another area and be destroyed. An
example of this is the Nazca plate being sub-ducted under the South
American plate to form the Andes Mountain Chain. The North and South
American plates are crashing into the thinner and denser oceanic plates
of the Pacific. This drives the oceanic plates deep into the mantle
destroying the oceanic plates. This boundary in which an oceanic plate
is driven down and destroyed by a continental plate is called a
subduction zone. |
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