Plate Tectonics: The theory that the earth's crust is broken into about 10 fragments (plates,) which move in relation to one another, shifting continents, forming new ocean crust, and stimulating volcanic eruptions.
(the earth's crust; is broken; into about 10 fragments) (about 10 fragments; move; to one another)
the earth's crust about 10 fragments
is broken move
into about 10 fragments
to one another