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How the Earth's crust is split into large sections called tectonic plates is described. Their movement and effects at plate boundaries are explained e.g. earthquakes, volcanoes, mountain building, ocean ridges/trenches, subduction (part of the rock cycle).
As the oozy mantle surges below, it carries the plates along, crashing them into each other in some spots, and pulling them apart in other regions. But scientists were at a loss to explain why some pieces of crust move much faster than others. A new study suggests these tectonic plates control their