How are island created by plate tectonic movements?

The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth's mantle below the crust. Earthquakes and volcanoes are the .... Each shield volcano grows slowly with repeated eruptions until it reaches the surface of the water to form an island (Fig. 7.25). read more

Most movement occurs along narrow zones between plates where the results of plate-tectonic forces are most evident. There are four types of plate boundaries: Divergent boundaries -- where new crust is generated as the plates pull away from each other. read more

Tectonic Plates and Active Volcanoes of the World: Most active volcanoes are located along or near the boundaries of Earth's shifting tectonic plates. Hawaiian volcanoes, however, occur in the middle of the Pacific Plate and are formed by volcanism over the Hawaiian"Hot Spot" (see text). read more