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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).
This is a map of the main tectonic plates that comprise the Earth's surface: In the Pacific Northwest movement of three tectonic plates drive our earthquake hazard. The Pacific Plate is moving to the northwest at a speed of between 7 and 11 cetimeters (cm) or ~3-4 inches a year. The North American plate is moving to the west-southwest at about 2.3 cm (~1 inch) per year driven by the spreading center that created the Atlantic Ocean, the Mid Atlantic Ridge.