Natural features

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Across
  1. 2. a natural rock formation with an opening that resembles an arch
  2. 3. a body of water surrounded by land
  3. 4. a steep, vertical or near-vertical rock face
  4. 7. a hot spring that periodically erupts water and steam
  5. 8. a very large cave, often with extensive chambers
  6. 9. a narrow valley with steep rocky walls
Down
  1. 1. a place where water drops vertically or steeply over a ledge
  2. 4. a deep valley with steep sides, typically carved by a river
  3. 5. a long, narrow sea inlet carved by glaciers
  4. 6. a point where groundwater naturally emerges at the surface
  5. 8. a natural underground chamber or passage in rock