Yellowstone National Park is for the largest part situated in the state of Wyoming in the United States and is the first national park in the world. Underneath Yellowstone lies a supervolcano which erupts every 600000 years on average. The last eruption was over 640000 years ago. The national park measures at an area of 900000 hectare and is mainly one large volcanic crater. Resulting in quite some activity like hot springs and geysers.
Boiling depicts one of these hot springs with colourful run off under an especially threatening sky. This was shot only moments before a heavy summer hail storm broke loose.