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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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