How thick are the plates in the Plate Tectonics theory?
A) About 50 km thick because they are only made of the continental crust.
B) About 660 km thick because they are made of the crust and all of the upper mantle.
C) The plates are only part of a conceptual model of the Earth and have no real thickness.
D) About 310 km, which is the difference between the top 2 numbers on the diagram (410-100) .
E) About 100 km thick, because they are made of the lithosphere.