Question

If subduction occurs beneath the continental crust a(n) _____________ is formed. If subduction occurs beneath the oceanic lithosphere, a(n) __________ is formed.

Answer 1

If subduction occurs beneath the continental crust a _Continental Arcs_ is formed. If subduction occurs beneath the oceanic lithosphere, an _Island Arcs__ is formed

Step-by-step explanation:

Continental arcs also known as ocean-continent subduction are formed during subduction of oceanic lithosphere beneath a continental lithosphere

While,

Island arcs also known as ocean-ocean subduction are produced by the subduction of oceanic lithosphere beneath another oceanic lithosphere

Answer 2

a. CONTINENTAL VOLCANIC ARC is formed.

b. ISLAND VOLCANIC ARC is formed.

Step-by-step explanation:

a. Continental Volcanic arc can be defined as an active land form when the subduction of the Oceanic crust or lithosphere occurs beneath the Continental crust. An example of a Continental Volcanic arc is a Cascade volcano. The magma produced at a Continental volcanic arc is very high in Basalt.

b. Island Volcanic arc is an active land form that is formed when the subduction of the oceanic crust or lithosphere occurs beneath the oceanic crust. An Example of an Island Volcanic arc is Japanese Archipelago. The magma produced at an Island volcanic arc has a high silica content.