Volcanic

a hill or mountain with an opening through which molten rock, ashes etc periodically erupt, or have erupted in the past, from inside the earth

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