A boundary at which Earth's plates collide and area is lost either by shortening and crustal thickening or by subduction of one plate beneath the other. The site of volcanism, earthquakes, trenches, and mountain building. (See also Subduction zone.)
A plate boundary where two lithospheric plates collide head-on. Convergent plate boundaries are sites of considerable geologic activity and are characterized by volcanism, earthquakes, and crustal deformation. See also: subduction zone.
Area where earth's lithospheric plates are pushed together. See subduction zone. Compare divergent plate boundary, transform fault.