Chapter 9, Problem 17EAP

Surprising Discoveries?

Suppose we were to make the following discoveries. (These are not real discoveries.) In ligh of your understanding of planetary geology, decide whether the discovery should be considered reasonable or surprising. (In some cases, both view can be defended.) Explain your answer, if possible tracing your logic back to the terrestrial worlds' fundamental properties of size, distance from the Sun, and rotation rate.

17. New photographs reveal sand dunes on Mercury.