Mount St. Helens, WA

Looking down into the "crater" that exists where the top of Mt. St. Helens used to (it's actually called a "caldera"). All the gray around the base of the mini hill in the center of the picture is actually ash-covered snow. The sides of the caldera are very unstable, even more than two decades after the eruption. Every few minutes a bunch of rock would tumble down from one side of the caldera or the other, kicking up ash, which then settles on top of the snow. In fact, the only reason we knew it was snow is because a good size rock tumbling down cut through the ash, revealing a long, white streak.