Tectonic plate movement is created by in the underlying mantle.

Which year held a congressional election and a presidential election

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted

What does the plate tectonic theroy describe?