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1 The lithosphere is composed of the crust, and some of the upper mantle. 2  Mature oceanic plate is approximately 80-100 km thick, of which, the upper 5-7 km is oceanic crust. 3  Continental plate is somewhat thicker, perhaps 150-200 km thick, and includes continental crust which varies from 5 to 70 km in thickness. At other convergent boundaries, oceanic plate meets other oceanic plate. 2  This results in an oceanic trench and a chain of volcanic islands known as an island arc. Japan, the Philippines and the Aleutians are examples of island arcs. 3  At some convergent boundaries, two continents collide.
The lithosphere is a rigid and brittle solid while the asthenosphere is a soft and ductile solid. (The terms crust and mantle are used to denote differences in chemical composition; while the terms lithosphere and asthenosphere are used to denote differences in physical state (for example, rigid, brittle solid vs..