The theory of suggests that the crust of the earth moves about on the upper mantle

The correct answer is plate tectonics. This theory encompases many different explanations for litosphere behavior which in turn means that it also encompases the theory that the crust moves about on the upper mantle. It also explains how continents are formed and how mountains grow and how tectonic plates hit each other and many other things.

Hey i don’t know answer

Answer they are produced by collision of tectonic plates;