Mount Shasta in Northern California
Mount Lassen in Mount Lassen National Park, California
The volcanic island of Nea Kameni in Greece. Taken from Thera on the island of Santorini.
The crater on the volcano, Nea Kameni near Santorini in Greece
The crater on the volcano, Nea Kameni near Santorini in Greece
The crater on the volcano, Nea Kameni near Santorini in Greece
The crater on the volcano, Nea Kameni near Santorini in Greece
The crater on the volcano, Nea Kameni near Santorini in Greece
A lava field on the volcano, Nea Kameni near Santorini in Greece
Boats anchored off the volcanic island of Nea Kameni, near Santorini in Greece
Inside a fissure in the volcano Nea Kameni, near Santorini in Greece
A steam vent on Solfatara di Pozzuoli in the Phlegrean Fields near Naples, Italy
Vesuvius from Capri, looking across the Bay of Naples
Norris Geyser Basin, Yellowstone National Park.
The Mud Volcano Area, Yellowstone National Park, Wyoming.
Boiling mud in the Mud Volcano Area of Yellowstone National Park, Wyoming.
The Mud Volcano Area, Yellowstone National Park, Wyoming.
Norris Geyser Basin, Yellowstone National Park, USA.
The Echinus Geyser in the Norris Geyser Basin, Yellowstone National Park, USA.
Fountain Paint pots, Yellowstone National Park, USA.
The Excelsior Geyser Crater, Yellowstone National Park, USA.
The edge of Grand Prismatics, Yellowstone National Park, USA.
Mount St Helens, from the Information Center near Interstate 5, Washington State, USA.
Fife Peak on the flanks of Mt Rainier, Washington State, USA