1. Sinks
   1. AKA
      1. Sluggas
      2. Swallow holes
   2. caused by
      1. carbonation
      2. gravity
   3. formed
      1. acidic rainwater disolves along joint
      2. gets large enough for river
      3. Sped up by
         1. pebbles
         2. sand
      4. Vally is left dry
         1. "A Dry Vally"
   4. EG
      1. Poul na gColm (Clare)
      2. Pollbeg (Mayo)
2. Limestone paving
   1. made of
      1. clints
      2. grikes
   2. how
      1. water flows down along
         1. joints
         2. bedding planes
      2. enlarges joints
         1. long
         2. narrow
         3. grikes
      3. remaining rock is Clint
   3. EG
      1. Black Head (Clare)
3. Caves
   1. formed by
      1. carbonation
      2. flowing water
         1. pebbles
         2. sand
      3. acidic ground water