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Encyclopedia > Sunda Arc

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	Sunda Arc - Wikipedia, the free encyclopedia (168 words) The Sunda Arc is a volcanic arc that has produced the islands of Sumatra and Java and the Sunda Strait and the Lesser Sunda Islands. The arc marks an active convergent boundary between the East Eurasian plates that underlie Indonesia, especially the Sunda Plate and the Burma Plate, and the Indo-Australian Plate that also forms the seabed of the Indian Ocean and the Bay of Bengal. The Sunda Arc is a classic example of a volcanic island arc, in which all the elements of such geodynamic features can be identified. Island arc - Wikipedia, the free encyclopedia (240 words) An island arc is a type of archipelago formed by plate tectonics as one oceanic tectonic plate subducts under another and produces magma. Partial melting of the overriding mantle generates low-density, calc-alkaline magma that buoyantly rises to intrude and be extruded through the lithosphere of the overriding plate. On the subducting side of the island arc is a deep and narrow oceanic trench, which is the trace at the Earth’s surface of the boundary between the downgoing and overriding plates.
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