The movement of which layer of Earth drives the motion of the plates on Earth's crust?
uoper mantle
lower mantie
outer core
inner core

The earth's internal process which drives seafloor spreading is

The blue segment below is a diameter of oo. what is the length of the radius of the circle?

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d