These plates are formed at ocean ridges and slowly migrate until they reach "subduction" zones where they re-enter the earth at an average rate of six (6) cm annually.
(These plates; are formed; L:at ocean ridges) (These plates; slowly migrate; T:until they reach "subduction" zones) (they; reach; subduction" zones where they re-enter the earth at an average rate of six (6) cm annually) (they; re-enter; the earth; L:subduction" zones)
These plates These plates they they
are formed slowly migrate reach re-enter
L:at ocean ridges
T:until they reach "subduction" zones
subduction" zones where they re-enter the earth at an average rate of six (6) cm annually
the earth L:subduction" zones