Yellowstone thermal features emit steam backlit by sun, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North AmericaWyoming, USA

Light therapy lamps emit white light imitating daylight. They are used, between among other things, to fight against seasonal affective disorder.

Hawaii, Big Island, Hawaii Volcanoes National Park, lava flows into forest burning trees

Hawaii, Big Island, Hawaii Volcanoes National Park, Kilauea, Pu'u O'o eruption, fountaining action

Hawaii, Big Island, Hawaii Volcanoes National Park, lava flow glows in early dawn

Hawaii, Big Island, Hawaii Volcanoes National Park, Molten lava seen through hole in lava tube.

Hawaii, Big Island, Morning sky filled with pink and gray smoke, lava flow into ocean

Hawaii, Big Island, Kalapana, flowing lava consumes road at Kalapana

Hawaii, Big Island, Hawaii Volcanoes National Park, Kilauea Volcano, hot lava moving to the sea

Hawaii, Big Island, Kalapana, Lava flow covers tree lined road

Hawaii, Big Island, Hawaii Volcanoes National Park, Pu'u O vent rift eruption, burned trees

Hawaii, Big Island, Hawaii Volcanoes National Park, Kilauea, Pu'u O'o eruption, close-up fountaining action

Hawaii, Big Island, Hawaii Volcanoes National Park, Volcanic eruption, Kilauea

Hawaii, Big Island, Hawaii Volcanoes National Park, Lava action erupting

Hawaii, Big Island, Hawaii Volcanoes National Park, Lava action meeting sea

Hawaii, Big Island, Puna, Lava flow Across Highway 130

Hawaii, Big Island, Hawaii Volcanoes National Park, Lava Exploding as lava flow hits the ocean

Hawaii, Big Island, Kilauea Volcano, Lava Meets the sea Pouring Lava

Hawaii, Big Island, Hawaii Volcanoes National Park, close-up of lava flow into sea

Hawaii, Big Island, Hawaii Volcanoes National Park, Kilauea Volcano eruption, smoke, lava flow at night

Hawaii, Big Island, Kilauea Volcano, Lava Meets the sea

Hawaii, Big Island, Kamoamoa, Lava into sea

Hawaii, Big Island, Hawaii Volcanoes National Park, Lava flowing in to sea, Kilauea Volcano