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Complex Volcanoes

In fact all volcanoes could be complex volcanoes since all of them are made up of multiple flows, ash layers, domes, cones, etc. in varying amounts.

However, when we call a volcano a complex volcano it is because we mean the "system" of those volcanoes is not "simple".  Caldera complexes for instance have often got a large caldera with many subsidiary vents and deposits, some of which could be considered "volcanoes" in their own right.

Frankly speaking, a volcano that consists of a complex of two or more vents is reckoned as a compound or complex volcano.


Information supplied by: http://volcano.und.nodak.edu