Speleology

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Across
  1. 2. mound-like rock formation on a cave-floor
  2. 5. related to underground structures natural/man-made
  3. 6. a natural void in the earth
  4. 9. animals able to live their entire life in a cave
  5. 10. depression or hole in the ground
  6. 11. common type of carbonate sedimentary rock
  7. 13. limestone regions with underground water systems
Down
  1. 1. cave zone with reduced/dim light
  2. 2. icicle-shaped formation hanging from a cave-ceiling
  3. 3. person who lives in a cave
  4. 4. cave zone with absolute darkness
  5. 7. an underground waterbody
  6. 8. cave guest animals
  7. 12. cave opening and the immediate area