Have you ever shot landscapes in the early morning or late evening? If
you
wait for just that right second, the low lighting angle will reveal very
subtle contours that don't show up at noon.

Contour would be a main key, just a slight down slope would be a very
dramatic change in lighting, you can tell the sun was pretty low. The moon
has hills and valleys just like Earth. Sad that some people have such
negativity that they can make up their own science to support their
thoughts...but then again history is full of that