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Concretions colored by sulfur Volcano Dallol Ethiopia - 504721-BS1 Photo: ©Jean-Luc & Françoise Ziegler - Biosphoto Click a keyword below to search for other images acid lake afar depression afar desert afar region afar triangle afrasia africa afro-eurasia assignment assignments atmosphere atmosphere ambiance atmospheres ambiance break breaks calcareous tufa calcareous tufas calcarious tufa calcarious tufas canicular day canicular days chemical element chemical elements color colors colour colours concretion concretions continent continental area coverage coverages dallol volcano danakil depression danakil desert danger dangers degraded matter degraded matters earth's crust east africa east-african rift valley eastern africa ecosystem ecosystems environment environments ethiopia eurafrasia fracture geology fractures geology freshwater freshwater lake fresh-water lake freshwater lakes fresh-water lakes freshwater wetland area freshwater wetland areas freshwater wetland zone freshwater wetland zones freshwaters geologic form geologic forms geological formation geological formations geyser geysers heat horn of africa hot source hot sources image and subject landform landforms landmass landmasses landscape landscapes localisation localization location matter matters meteorological phenomena meteorological phenomenon mineral matter mineral matters natural area natural areas nature news coverage news coverages news stories news story northeast africa old world orange oranges panorama panoramas physicochemical rock physico-chemical rock physicochemical rocks physico-chemical rocks report reports rift valley risk risks rock rocks salt salts scorching scorching heat scorching heats sedimentary rock sedimentary rocks skies sky solid chemical element solid chemical elements somali peninsula sour sourness sournesses sulfur s sulphur surrounding surroundings texture textures travertine volcanic ground volcanic grounds volcano volcanoes warm warmth warmthes yellow yellows horizontal jean-luc & françoise