0

Salton Sea Mud Volcanoes

These two square miles of gurgling and burping mud volcanoes are not actually volcanic in origin. They are created by carbon dioxide bubbling up through a muddy slurry.

28

Fly Geyser

Located on a gated parcel of private property within the million-acre Black Rock Desert, Fly Geyser was created accidentally in 1964 from a geothermal test well inadequately capped.