Answer:
The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways in relation to each other. They move at a rate of one to two inches (three to five centimeters) per year.Basically they move at different speeds because they are not all identical in a perfectly identical system. Like many things in the Earth Sciences, the answer to this is "because local details." Slab pull. Cold, dense oceanic plates sink into the mantle at subduction zones, pulling the rest of the plate after them.
Explanation:
