Natural places

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Across
  1. 2. A deep gorge, sometimes with a river flowing through it.
  2. 4. A large hole inside a cliff or a mountain.
  3. 5. A mountain or hill with a crater through which lava erupts.
  4. 7. An area of open land.
  5. 8. A luxuriant, dense forest, usually found in tropical areas with consistently heavy monsoon.
  6. 9. A high area of rock, often on a coast.
Down
  1. 1. A cascade of water falling from a height.
  2. 3. A naturally raised areas of land.
  3. 4. A part of land near the sea.
  4. 6. A line of rock, sand or coral, often dangerous to ships.