Answer:
The answer is C.The outer shell is divided into plates that glide over the mantle.
Step-by-step explanation:
Plate tectonics is a theory that explains how the lithosphere is structured, which is composed of two different types of lithosphere: the thicker continental crust, and the oceanic crust, which is relatively thin. This theory gives an explanation to the tectonic plates that are part of the Earth's surface and to the landslides that are observed between them in their movement over the earth's mantle.