The Krakatoa Volcano

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The Krakatoa volcano and the surrounding volcanoes are located along the Indonesian Island Arc in the western Pacific. The Indonesian Island Arc system was created by the northeastward subduction of the Indo-Australian plate with the Eurasian plate. The entire Arc system includes over 130 active volcanoes which is the most of any other nation in the world. The Krakatoa volcano itself sits directly above the subduction zone itself, producing a massive strato-volcano chain.
Being located directly over the subduction zone boundary makes this region extremely unstable, causing many of the volcanoes in the area to experience explosive volcanism. Much of the magma from the volcanoes in this region are felsic in nature with a moderate Silica content.

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