EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Islands are created along the mid ocean ridge as new oceanic crust is formed.
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Islands are created one at a time as the plate moves across a hot spot in the mantle.
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Islands are created along a subduction zone as oceanic crust is forced back down in to the mantle.
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Islands are created as pressure is released when two tectonic plates are pulled apart.
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Detailed explanation-1: -Which answer below correctly describes the formation of a volcanic island arc? Islands are created along the mid ocean ridge as new oceanic crust is formed.
Detailed explanation-2: -An island volcanic arc forms in an ocean basin via ocean-ocean subduction. The Aleutian Islands off the coast of Alaska and the Lesser Antilles south of Puerto Rico are examples. A continental volcanic arc forms along the margin of a continent where oceanic crust subducts beneath continental crust.
Detailed explanation-3: -Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other.
Detailed explanation-4: -When two oceanic plates collide against each other, the older and therefore heavier of the two subducts beneath the other, initiating volcanic activity in a manner similar to that which occurs at an oceanic-continental convergent plate boundary and forming a volcanic island arc.
Detailed explanation-5: -Island arcs are formed when tectonic plates collide at a subduction zone in the ocean. The oceanic plate sinks under the continental plate and lava leaks into the crust, bubbling up to eventually form islands.