Question

differences and similarities of a continental volcanic arc and a volcanic island arc​

Answer 1

Answer:

A volcanic island arc is formed when two oceanic plates converge and form a subduction zone. The magma produced is of basaltic composition. A continental volcanic arc is formed by subduction of an ocean plate beneath a continental plate. The magma produced is more silica rich than that formed at a volcanic island arc.

Answer 2

when two oceanic plates converge and form a subduction zone.

Explanation:

Continental volcanic arc:

• Subduction of an ocean plate beneath a continental plate creates a continental volcanic arc. The resulting magma has a higher silica content than magma created in a volcanic island arc.
• When oceanic crust subducts beneath continental crust, a continental volcanic arc forms along the continent's border. They usually have silicic and basaltic volcanic rock as well as volcaniclastic materials in them.

Volcanic island arc​:

• Volcanic arcs are formed when an oceanic tectonic plate subducts beneath another tectonic plate, and they generally run parallel to an oceanic trench.
• The magma rises in an arc parallel to the subduction zone, forming a series of volcanoes.