Mono Lake The formations in the background are called "tufa". A long time ago, the lake level was higher and these formations were underwater. Fresh water ran down from the mountains in the distance, underground, ran under the lake, and then bubbled up into the lake, leaving sort of an upside-down stalagtite in the lake. Later, the lake level fell to its current level, leaving the formations high and dry.
Feature film about Flagging & the Evolution of the Flow Arts.