Marie Read / Osprey (Pandion haliaetus) taking flight from tufa tower carrying a fish, Mono Lake, California, USA
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Jack Dykinga / Engelmann spruce (Picea engelmannii) growing amongst pinnacles of volcanic tuff, dawn, Wheeler Geological Area Wilderness, Rio Grande National Forest, Colorado, USA
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Jack Dykinga / Tufa pinnacles in the sunset afterglow at the edge of Mono Lake, Mono Lake State Reserve, California, USA
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Gavin Hellier / Hot Air Balloon flight over the famous Volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Elevated view over the Volcanic tufa rock formations surrounding Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Elevated view over the Volcanic tufa rock formations surrounding Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Volcanic tufa formations, known as Fairy Chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Volcanic tufa formations, known as Fairy Chimneys, near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Volcanic tufa formations, known as Fairy Chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Aerial photograph of the Tufa rock formations and landscape near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Aerial photograph of the Tufa rock formations and landscape near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Aerial photograph of the Tufa rock formations and landscape including the Rock Church of St John the Baptist in Cavusin, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Hot Air Balloon with the Worlds largest passenger basket just above the tufa rock formations near Goreme, Cappadocia, Anatolia, Turkey, 2008
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Gavin Hellier / Man tending his vineyard in front of Tufa rock formations in the Rose Valley near Goreme, Anatolia, Turkey, 2008
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Tim Fitzharris / Tufa at Mono Lake, Sierra Nevada, California
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Angelo Gandolfi / View of the entrance to ancient cave dwellings, carved out of tufa rock, at Vitozza troglodyte settlement, Tuscany, Italy. March 2009
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Angelo Gandolfi / Cave church of Saint Sebastiano. An Etruscan "via cava" (Hollow road), cut into tufa rock. Tuscany, Italy. November 2008
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Angelo Gandolfi / Ancient Roman roads excavated from the tufa rock, of Etruscan origin. Pitigliano, Tuscany, Italy. March 2009
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Angelo Gandolfi / Interior of medieval cave dwellings, carved out of tufa rock, at the Vitozza troglodyte settlement Tuscany, Italy. April 2009
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Angelo Gandolfi / Medieval cave dwellings, carved out of tufa rock, at the Vitozza troglodyte settlement Tuscany, Italy. April 2009
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Angelo Gandolfi / A medieval cave dwelling, carved out of tufa rock, at the Vitozza troglodyte settlement Tuscany, Italy. April 2009
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Angelo Gandolfi / The interior of the church / hermitage / stone chapel of Poggio Conte, excavated in tufa rock and painted. Lazio 'Maremma', Italy. April 2009
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Angelo Gandolfi / Entrance to the church / hermitage / stone chapel of Poggio Conte, excavated in tufa rock and painted. Lazio 'Maremma', Italy. April 2009
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Thomas Lazar / Morning light on calcium carbonate Tufa towers in mineral rice lake waters, Mono Basin National Forest Scenic Area, INYO National Forest, California, USA, June 2008
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Pete Oxford / Kicker Rock or Leon Dormido is an eroded tuff cone whose sheer sided cliffs are frequented by Boobies, Frigatebirds and tropic birds, Galapagos Islands, Ecuador
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David Welling / Tufa towers and summer wavy grass on edge of Mona Lake NP, California, USA
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David Welling / Sun about to set over Tufa towers and summer wavy grass on edge of Mona Lake NP, California, USA
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Adrian Davies / Tufa towers, Mono Lake, California, USA
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David Kjaer / Tufa towers in Lake Mono, California, USA
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Tui De Roy / Galapagos sunset with Kicker Rock, an old eroded tufa cone, San Cristobal Island, Galapagos Islands, Ecuador
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Tui De Roy / Kicker Rock, an old eroded tufa formation with tour vessel, near San Cristobal Island, Galapagos Islands, Ecuador
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Tui De Roy / Pinnacle Rock, tufa cone formation and volcanic beach, Bartolome Island, Galapagos Islands, Ecuador
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Tui De Roy / Kicker Rock an old eroded tufa formation with sailboat, Galapagos Islands, Ecuador
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Doug Wechsler / Tufa towers of calcium carbonate formed by alkaline spring water. Mono Lake, California, USA
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Tui De Roy / Sailboat dwarfed by Kicker Rock, an old eroded tuff cone, San Cristobal Island, Galapagos Islands, Ecuador
