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