Here we stopped at Zzyzx, California, for an Earth Cache, with a discussion of the geological processes by which they formed, and some questions that, at least theoretically, could be answered based on observations informed by those questions. The questions were not slam-dunk easy.

It In this two-picture top-bottom panorama, we see a dry lake bed in the background behind the highway. In the foreground, a ridiculous amount of garbage has accumulated along the offramp.