Cave Formation Crossword

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Across
  1. 2. A series of colapse caves forming a valley
  2. 3. Acid, Dissolves limestone
  3. 5. Caverns, Used as an underground cave prison
  4. 6. Rock formations hanging from the roof of a cave
  5. 7. million, How many years ago was Howe Caverns most likely to have been formed
Down
  1. 1. Rock formations coming up from the ground
  2. 4. Howe, "Discoverer" of the Howe Caverns