"All plates are moving relative to all others. There are grounds for suggesting that the African plate may now be approximately fixed relative to the deep mantle, but if so it is the only such plate. Velocities of relative motion between adjacent plates range from less than 1 centimeter (a small fraction of an inch) to about 13 centimeters (5 inches) per year. Although these velocities are slow by human standards, they are extremely rapid by geologic ones: a motion of 5 centimeters (2 inches) per year, for example, adds up to 50 kilometers (30 miles) in only 1 million years, and some plate motions have been continuous for 100 million years." USGS