Fumarole steam vents on Roaring Mountain in winter at Yellowstone National Park

green; cyanobacteria; cyanobacterial; heated; heat; fumarole; vent; geothermally; geothermal; hot; springs; winter; snow; Yellowstone; National Park; Wyoming; steam; sulfur; acid; pH; Oscillatoria; microbial; bacteria; thermophiles; steaming; trees; evergreen; pine; lodgepole; warm; stream