The bright blue, green and orange colors of the geothermal geyser Old Faithful are caused by thermophiles or microscopic organisms that thrive in hot temperatures in spring water rising from deep within the ground.

The 60-year-old was walking with her husband and dog near a geyser when she broke through the ground into scalding waters on Monday afternoon, according to the National Park Service.

The woman was walking off-trail with her husband and leashed dog in a thermal area when she broke through a thin crust over scalding water

A 60-year-old woman from New Hampshire suffered second and third degree burns while walking off trail in a thermal area at Old Faithful in Yellowstone National

The woman was walking off-trail with her husband and dog in a thermal area near Mallard Lake Trailhead at Old Faithful when she injured herself.

A 60-year-old woman suffered second- and third-degree burns to her lower leg this week while walking off-trail in Yellowstone National Park, officials said.

A woman visiting Yellowstone National Park reportedly suffered second- and third-degree burns after wandering off-trail in a thermal area on Monday, park officials announced. The unidentified woman, 60,

A hiker was airlifted to hospital with burns from “scalding water" while walking off-trail at a thermal area at Yellowstone National Park on Monday, the National Park Service said.