Pumice below Novarupta volcano, Valley of Ten Thousand smokes. Katmai National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.katm21133.html Pines trees and shrubs on cinder slope at sunrise. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44930.html Pumice plain. Crater Lake National Park, Oregon, USA. http://www.terragalleria.com/parks/np-image.crla44978.html Dwarf buckwheat growing in arid cinder. Craters of the Moon National Monument and Preserve, Idaho, USA http://www.terragalleria.com/america/idaho/craters-of-the-moon/picture.usid8406.html Grasses and black cinder. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44936.html Detail of pumice, Valley of Ten Thousand smokes. Katmai National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.katm21136.html Dark pumice, cinder cones, and Pioneer Mountains. Craters of the Moon National Monument and Preserve, Idaho, USA http://www.terragalleria.com/america/idaho/craters-of-the-moon/picture.usid8403.html Sagebrush and pumice. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44935.html Pumice and wildflowers, Valley of Ten Thousand smokes. Katmai National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.katm0132.html Grasses and dark cinder. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44937.html Wildflowers, pumice, and distant peaks in storm, Valley of Ten Thousand smokes. Katmai National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.katm21132.html Pine trees, hardened lava. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44943.html Pumice and Novarupta (the center of the 1912 eruption), Valley of Ten Thousand smokes. Katmai National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.katm0104.html Cinder and Sunset Crater at sunrise. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44931.html Steam rising from cinder landscape. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44942.html Pines on cinder slopes of crater at sunrise. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44929.html Cinder and forest. Sunset Crater Volcano National Monument, Arizona, USA http://www.terragalleria.com/america/arizona/sunset-crater-volcano-national-monument/picture.usaz44932.html