The order, from the longest time period to the shortest time periord is: Era, Period, Epoch
Explanation:
In the geological time scale we have divisions that go from the longest tho the shortest: Eon, Era, Period and Epoch. The more recent Eon is the Phanerozoic Eon in wich we find 3 eras: Paleozoic, Mesozoic and Cenozoic. Each era has different periods, forme example, in the Mesozoic we find the Triassic, Jurassic and Cretaceous periods and finally each period has a division in epochs, those could be for example Lower, Middle and Upper.
The areas in which new sea floor and oceanic lithosphere are formed are called spreading centers, and the areas where older oceanic lithosphere is recycled as it descends and melts are called subduction zones.