Which statement describes the theory of plate tectonics? O A. The asthenosphere is composed of magma that causes
earthquakes as it rises toward Earth's surface.
B. Earth's crust is composed of plates that form as the
seafloor spreads at mid-ocean ridges.
O c. The plates that form continents are rising at the same time
as the plates under the ocean are sinking.
D. The lithosphere is composed of plates whose movements
help form Earth's features.