That Booming You Hear in the Skies Over Yellowstone National Park? It Soon Could be the Sound of Artillery
Ahh, the sounds of winter in Yellowstone National Park. The raspy rustle in the wind of dried leaves that forgot to fall from aspens. The trickling of a creek beneath its sheath of ice. The eruption of a geyser, the gurgling of mudpots. The explosion of a howitzer round as it smacks into a mountainside.