Scalding hot water cascades down a self-made rock feature. The water carries dissolved silica from underground streams. When the water evaporates, the silica is deposited on surfaces, hardens and forms sinter (aka geyserite) that creates these rock formations. Naive animals (including people) will sometimes be tempted to get too close to or actually into these hot pools to escape the extreme cold weather, often resulting in dire consequences.
Owen Slater Photography 
I like a nice hot bath…or a sauna…or a steam room.
But scalding water does cross the line!
The colours are fantastic.