Which type of landform develops at plate boundaries where one oceanic plate descends beneath another?
a. rift valley
b. volcanic island arc
c. mountain formed by a batholith
d. lava plateau

The answer is B. In a destructive plate boundary, the descending plate, usually the oceanic plate begins to melt as it descends below into the mantle. This forms magma that rises and erupts onto the overlying continental plate through fissures. This volcanic activity is responsible for geographical features such as the volcanic island arc, which lies parallel to the subduction zone.