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Archipelagos are usually volcanic, forming along island arcs produced by subduction zones (or hot spots).
They formed by tectonic activities when a tectonic plate moves over a hot- spot. the lava gets pushed and when there is enough, it rises to the surface of the water. as it cools it forms a pile (an island). the volcanic activity then stops but the plate carries on moving. so when it starts again, a new island is formed....
There are other processes involved in their construction: erosion, deposition and land elevation.
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∙ 9y ago
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