JOHN R. FOSTER / SCIENCE PHOTO LIBRARY JOHN R. FOSTER / SCIENCE PHOTO LIBRARY
A tour boat cruises around the Phantom Ship, a dramatic rocky island in Crater Lake. Crater Lake was formed from the violent eruption and caldera collapse of ancient Mt. Mazama 7,700 years ago. Rain and snow melt gradually filled the caldera to a depth of 1,943 feet. Oregon, USA.
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