硫黄
acid
afar
afar depression
afar desert
afar region
africa
at the edge of
beauty in nature
dallol
dallol volcano
eritrea
erupting
ethiopia
exploding
geology
iron oxide
lake of lava
lava
lava lake
mountain
multi colored
psychedelic
red
rift valley
rock object
scenics
scientist
smoke physical structure
volcanic crater
volcano
yellow