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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.
Relevance. Rating Newest Oldest. Best Answer: There's the comparison of the crust of the earth to an egg, if it was the same size the shell would be much thinner. The mantle lies below the lithosphere, or crust, which is composed of two general types of rocks, basaltic ocean plates and continental, less dense rock.est Answer: There's the comparison of the crust of the earth to an egg, if it was the same size the shell would be much thinner.