Sand is granular in nature, which allows air columns to trap in between them. As we know that air is an insulator of heat. So here are my questions:
Does sand maintain its temperatures close to its surface? (Like a conducting shell distributes charge on its surface)
If there were layers of sand, is it possible that in the deeper layers the temperatures remain constant? And only the temperatures of the upper layers changes as the surrounding environment changes?
P.S. If all of this is true is there a particular formula or a study I can use to figure out the temperature difference between the surface and at a depth in a desert?