What type of convergent plate boundary formed krakatoa?

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Krakatoa is a volcano on the Indonesian island of Rakata, between the islands of Java and Sumatra in the Sunda Strait. Krakatao is one of the volcanoes of the Sunda volcanic arc. The volcano was formed by the subduction of the Indian-Australia plate under the Eurasian plate. These are BOTH continental plates. The other geologic feature associated with this subduction zone is called an island arc or volcanic arc which describes the shape of the islands above the subduction zone. For example, take a look at the Indonesian islands which make up this area where Krakatoa is/was located -- they form an arc which bows out toward the Indian-Australian plate which is being subducted. Volcanic Arc: A generally curved linear belt of volcanoes above a subduction zone, and the volcanic and plutonic rocks formed there. Other examples would be the islands which make up Japan and the Aleutian Islands of Alaska. In a typical "island-arc" environment, volcanoes lie along the crest of an arcuate, ... more
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