As time goes by the sea floor is constantly spreading. The movement of the spreading is not very fast, and is normally determined in centimeters per year. To calculate the rate of the spreading, you need to use the following formula: the distance the sea floor moved divided by the length of time. This is an important concept for people in the earth sciences field. To complete these calculations, you will need maps showing the Earth's crust. These help highlight the movement.
Measure from a spot at which the plate is spreading outward to a spot with a known age point.
Use the map's scale to convert the measurement into actual inches of spreading over that time period.
Divide the distance the sea floor spread by the time it took to spread that far, to find the rate of spreading per year.
About the Author
Carter McBride started writing in 2007 with CMBA's IP section. He has written for Bureau of National Affairs, Inc and various websites. He received a CALI Award for The Actual Impact of MasterCard's Initial Public Offering in 2008. McBride is an attorney with a Juris Doctor from Case Western Reserve University and a Master of Science in accounting from the University of Connecticut.
sea gull above the sea image by alma_sacra from Fotolia.com