Editing Arc (section)

===Geology===
* Arc, in geology a [[mountain chain]] configured as an arc due to a common orogeny along a plate margin or the effect of back-arc extension
** [[Hellenic arc]], the arc of islands positioned over the Hellenic Trench in the Aegean Sea off Greece

* [[Back-arc basin]], a subsided region caused by back-arc extension

* [[Back-arc region]], the region created by back-arc extension, containing all the basins, faults, and volcanoes generated by the extension
* [[Island arc]], an arc-shaped archipelago, usually so configured for geologic causes, such as sea-floor spreading, common orogeny on the margin of the same plate, or back-arc extension
** [[Northeastern Japan Arc]], an island arc
** [[Banda Arc]], a set of island arcs in Indonesia
* [[Continental arc]], in geology a continental mountain chain or parallel alignment of chains (as opposed to island arcs), configured in an arc
** [[Eastern Arc Mountains]], a continental arc of Africa
* [[Volcanic arc]], a chain of volcanoes positioned in an arc shape as seen from above
** [[Aleutian Arc]], a large volcanic arc in the U.S. state of Alaska
* [[Nastapoka arc]], a circular coastline in Hudson Bay