Mount Rushmore National Memorial, South Dakota, USA Explosive Vulcanian eruption of lava on Sakurajima Volcano, Japan Mount Rushmore National Memorial, South Dakota, USA Kleftiko arch, Milos Island, Greece Paliorema sulfur mine and processing facility, Milos Island, Greece Grand Geyser erupting, Upper Geyser Basin geothermal area, Yellowstone National Park Lava bubble bursting through crust of active lava lake Lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of Congo Eruption of Strokkur Geysir, Iceland Chromatic Pool Hot Spring, Yellowstone National Park, Wyoming Devils Tower National Monument, Wyoming Incandescent rockfall of glowing lava down flank of Shiveluch Volcano Lava flowing into Valle del Bove at Mount Etna Volcano, Italy Grand Prismatic Spring, Yellowstone National Park, Wyoming