759-10713 - Pumice Stone Formation near Vilaflor, Tenerife, Canary Islands, Spain

832-393982 - Caldera volcano with pumice fields, yellow coloured sulphur stones, Alexandros crater, Nisyros, Dodecanese, Greece, Europe

1178-35268 - Close-up of hands using pumice stone on foot

1349-1012 - Mount St. Helens After Eruption

1311-117 - View of Sunset Crater Volcano from the east slope of the Lenox Crater Trail, the dark gray soil is volcanic pumice, Arizona, United States of America, North America

1116-39556 - Mt. Griggs rises over the ash- and pumice-covered Valley of Ten Thousand Smokes in Katmai National Park. The ash-covered Knife Creek Glaciers can be seen coming out of the valley at right; Alaska, United States of America

1116-39561 - The colorful landscape of the Valley of Ten Thousand Smokes and Baked Mountain in Katmai National Park; Alaska, United States of America

1116-39555 - The eastern peak of Trident Volcano rises above the ash-covered Knife Creek Glaciers at sunset in Katmai National Park; Alaska, United States of America

1116-39560 - A backpacker crosses the exotic landscape of the ash and pumice-covered Valley of Ten Thousand Smokes in Katmai National Park, with Mt. Katmai (left), Trident Volcano (right), and the Knife Creek Glaciers looming in the distance; Alaska, United States of

1116-39554 - Trident Volcano rises above the ash-covered Knife Creek Glaciers at sunset in Katmai National Park; Alaska, United States of America

1116-39558 - Mt. Griggs rises above the ash- and pumice-covered Valley of Ten Thousand Smokes in Katmai National Park; Alaska, United States of America

1131-1014 - Pumice stone field, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

832-248825 - Eastern edge of Mount Hood volcano and Elliot Glacier, Cooper Spur Trail, Cascade Range, Oregon, USA