How fast do tectonic plates move relative to each other (in km/year)?
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The movement of tectonic plates is relatively slow, occurring over millions of years. The average rate of movement is estimated to be around 2-15 centimeters per year (cm/year) or approximately 20-150 kilometers per million years (km/Ma). However, the rate of movement can vary depending on the location and type of plate boundary. For example, the rate of movement along the mid-Atlantic Ridge is around 2.5 cm/year, while the rate of movement along the San Andreas Fault in California is around 5 cm/year.