Black Pool

I know, I know.  It’s not black.  That is the name, though, of this very hot pool.

It used to be black.  Lower water temperature allowed thick mats of dark green and brown thermophiles (heat-loving microorganisms) to grow in the pool, causing it to appear black.  In 1991, the water temperature rose, killing the thermophiles.  It also erupted as a geyser that summer and several times the following winter.  Black Pool is now a quiet and beautiful pool.

2010 08 04 e 006panoed

Posted from Old Faithful Inn, Yellowstone National Park

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