side of the ridge(Fig. 2a). In this way, the plates move like a Figure conveyer belt over the asthenosphere, and get cooled as they(a) Sche move further away from the ridges. the mid rises up Since the Earth remains the same size over quite a island long period of geological time, the moving plates must be absorbed at some plac these are named convergent plate materi(b) The boundaries. The burial grounds of the plates are the ocean The su as a V trenches, where the plates plunge into Earth's interior Const This process is known as subduction, as occurs along the subd trench, the Japan Trench, and so on Andaman-Sumatra the R(Fig. 2b). The other type of convergent plate boundary(c) T forms the continent-continent collision zone, as happens This rele in the Himalaya, where the Indian plate is in a head-on collision with the Eurasian plate(Fig. 2c). The third type boundary, where the of plate boundary is the transcurrent Andreas Fault in California, between the Pacific plate and the North American plate(Fig. 1) arge and great earthquakes are generated along these plate boundaries, in the subduction, collision and transcurrent zones. The mid-oceanic divergent n zones normally generate smaller magnitude(M