ocr: Plate Tectonics -A earthquakes caused by relatively new theory that the tensile stress of - the proposes. that all colliding plates. 2nd.is earthquakes and volcanic more violent activity are caused by the earthquakes along faults movement of rigid blocks and sites where the called plates that make plates grind past each up the earth's surtace other In opposite layer. This layer IS directions, In the Jceari composed of a dozen this movement results In large plates and several volcanoisn that gives rise small ones. toi Islands such as this 3 types of activity can be one off the coast of Peru. fo ...