Active margin: A continental margin where one plate is being subducted under another plate because of plate convergence. Also called a Pacific or convergent margin. Antonym: passive, Atlantic, or trailing margin.

(a) Plate-tectonic model. A= rift zone where plates P1 and P4 are moving apart (such as the Mid-Atlantic Ridge) where new crust is being created. C= ocean trench resulting from overriding of plate P3 over P1 (or P2 over P4); B= Benioff-Wadati zone of earthquakes dipping along the contact of plates P1 and P2 which are colliding. T= transform faults where plates are sliding by each other.  (b) There are three kinds of plate boundaries. The junction of three plates constitutes a triple junction.


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