North American caves

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Across
  1. 1. The term for the pointy formations that hang from the ceiling of a cave. (10 letters)
  2. 4. This type of cave is formed by volcanic activity. (4 letters)
  3. 5. The type of rock often associated with cave formations. (7 letters)
  4. 6. The cave famous for its extensive gypsum formations. (7 letters)
  5. 8. The cave known for having the tallest underground waterfall. (4 letters)
  6. 9. This cave feature grows upward from the floor. (9 letters)
Down
  1. 1. A scientist who studies caves and cave formations. (9 letters)
  2. 2. tube The process of creating a cave by the flow of lava. (9 letters)
  3. 3. The underground equivalent of a canyon. (6 letters)
  4. 7. The process of cave formation by the dissolving of soluble rocks. (8 letters)