Hot spring
Yellowstone · 10 August 2021

A small spring boiling in its own basin, with the orange mat of the runoff channel behind. The white is sinter - silica, dissolved out of rhyolite deep underground by superheated water and dropped again the moment the water cools at the surface. It builds the rim the spring sits in, so a pool like this slowly constructs its own container.
The orange is life. Thermophilic bacteria and archaea, colour-graded by temperature: the hottest water is sterile and blue, and the cooler it gets the more the mats shift through yellow, orange and finally brown.
Birds, insects, plants and other wildlife, mostly from Brooklyn, with some from further afield.
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