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Sagot :
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.
An island arc and a volcanic arc are basically the equal type of geological function except for the truth that one is on land and the other is surrounded by using water.
- Plate tectonics drives the advent of volcanic arcs.
- A denser oceanic plate collides with a extra buoyant continental plate. The oceanic crusts’ density pulls it downward into the mantle where intense heat melts it.
- The molten rock and volatiles (magma) then paintings their manner upwards often reaching the floor and erupting. The arc form is the floor trace of the location where the downgoing plate is melting. it's miles an arc due to the fact the earth is a spherical form.
tons of the Pacific rim, substantially Japan, Polynesia and the Aleutians are island arcs.
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