A. Indonesia.
the Federated States of Micronesia and the Indonesia (both of which consist of thousands of islands). Others consist of a single island, such as Nauru, or part of an island, such as Haiti.
The energy is generated by the semi-molten core of the earth which drives the convection currents in the mantle and which causes the plates to move in plate tectonics. James Hutton was the first geologist to intepret that the plutonic rocks on surface like granite were once molten.