Scientists have learned that the Earth's crust is fractured into a series of "plates" that have been moving very slowly over the Earth's surface for millions of years.
(plates; have been moving very slowly; T:over the Earth's surface for millions of years) (Scientists; have learned; that the Earth's crust is fractured into a series of "plates) Context(Scientists have learned,List([0, 23))):(the Earth's crust; is fractured; )
Scientists have learned,List([0, 23))
plates Scientists the Earth's crust
have been moving very slowly have learned is fractured
T:over the Earth's surface for millions of years
that the Earth's crust is fractured into a series of "plates