Answer:
Option(d)
Japan, the Aleutian Islands (part of Alaska), and the islands of the south seas were all formed by collision of two plates at mid-ocean ridges.
Explanation:
An island is formed when two oceanic plates collide and due to the difference in density one plate goes below the other, resulting in the coming upwards of some material. SiMa ( iron and magnesium) and mafic rocks forms the oceanic crust.
The earth's inner heat mobilize the inner mantle thus causing a movement of plates.
