(Kelly of the Clue Crew reports from inside Carlsbad Caverns Nat'l Park, New Mexico.)  Calcite formations called soda straws are precursors to these larger formations that grow from cave ceilings
... National parks preserve wondrous landscapes, stories, and 
artifactsas ... Report Polluted Parks: How Dirty Air is Harming America's 
National Parks... [DOC] [TLE] include bacteria fungi: Topics by Science.gov [PAR] Fungi and bacteria involved in desert varnish formation .....