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Convergence of Plates-Continent-Continent
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1

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During a continent-continent collision, what happens to the accretionary wedge of sediments accumulating above the subduction zone?
A)The accretionary wedge is subducted downward into the mantle
B)The accretionary wedge is uplifted and incorporated into the rising mountain belt
C)The accretionary wedge is carried into the subduction zone and melted
D)The accretionary wedge is thrust beneath the overriding plate and metamorphosed
E)All of the above
2
Why are modern mountain belts forming from continent-continent collisions, such as the Alps and the Himalayas, lacking volcanic activity.
A)Volcanic activity stops during the collision when oceanic lithosphere is no longer being subducted
B)Magma generated during the collision becomes trapped beneath the continental plates and does not erupt to the surface
C)Subduction of the lithosphere does not generate magma and volcanism
D)Continental rock cannot melt
E)The premise of the question is false – both the Alps and the Himalayas are volcanic mountain ranges
3
Why does the uplift of high mountains occur during a continent-continent collision?
A)The crust in the collision zone is compressed and thickened
B)The continental crust of the subducting plate is thrust beneath the crust of the overriding plate, doubling the thickness of continental crust.
C)Heating of the rock in the collision zone causes the crust to expand and rise up on the asthenosphere below
D)Both a and b are involved in uplifting mountain belts
E)Isostatic rebound at the trench pushes the continental crust upward
4
As high mountains such as the Himalayas are uplifted in a continent-continent collision, what happens to the sediments eroded from the rising peaks?
A)The sediment is washed into the trench at the subduction zone
B)The sediment is uplifted and incorporated into the mountain range
C)The sediment is buried beneath the rising mountains and metamorphosed
D)The sediment is deposited in subsiding basins adjacent to the mountain belt
E)All of the above
5
What metamorphic conditions would be found deep in the crust beneath a continent-continent collision?
A)high temperature
B)high pressure
C)both high temperature and high pressure
D)high pressure but low temperature
E)low pressure but high temperature





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