the cave cross word puzzle

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Across
  1. 2. Entrance to a cave
  2. 5. Another name for cave paintings
  3. 6. A cave used by bats
  4. 7. A cave explorer
  5. 8. Natural underground cavity
  6. 9. Underground water stream
Down
  1. 1. Formations hanging from the ceiling of a cave
  2. 3. An underground chamber or cavern
  3. 4. A type of cave formation made of mineral deposits