(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
In fact, there have been 13 reports over the last 20 years that have called for... [DOC] [TLE] Crossword Solver - Scribd [PAR] It should be noted that 'ise' endings are also possible for these.