Dissolving mountains.

   Craggy & rugged outside.
      Stone pock-marked & pitted,
      Deformed natural bonsai
         growing out of the cliff.

   Hollow on the inside.
      Amorphous caves tunnel
         under those rocky tops,
      Smooth lumpy cave floors
         and walls,
      Rough & gritty stalactites 
         overhead.
      
How long does it take to dissolve
   a mountain?