Under the Theory of Plate Tectonics,the Plates Themselves Are ________

Multiple Choice

Under the theory of plate tectonics,the plates themselves are ________.

A) discrete pieces of lithosphere at the surface of the solid Earth that move with respect to one another
B) discrete layers of lithosphere that are vertically stacked one atop the other
C) composed only of continental rocks that plow through the weaker oceanic rocks
D) very thick (approximately one-quarter of Earth's radius)