It looks like snow, but it's not!
Piles of salt surround an evaporation pond* in the valley near Glendale, Arizona. A
large commercial operation here mines the salt hydraulically from hundreds of feet below
The salt is what's left of a large lake that occupied this part of Arizona
during the , when a series of lakes
existed in other parts of the Southwest as well -- water trapped in valleys broken up by faulting during a wetter period in the Earth's history.
* photo by Richard Allen; used with company permission.