There's a lot of interesting geology and geology-related phenomena in this image. The anoxic sediments that give rise to the sulfur precipitation in the water column fall under the "geology" heading. On the coast (and particularly in the higher-resolution image that is linked on the page above) you can see the Brandberg Mountains (a granitic pluton, I think). Also in the high-res image, at the top you can see some sediments from a river that manages to flow through one of the driest deserts on Earth, the Namibian coast.
Don't forget to check out the other images on the page today, including a high-altitude close-up of Mt. Everest that messes with your perspective.
I'll do a non-remote-sensing image next week, I promise. More action from Kilauea can be seen on this page:
Very cool indeed. Thanks again for posting these.