Nature crossword

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Across
  1. 1. For example Wisła or Warta
  2. 5. a place where water from a river or stream falls down over a cliff
  3. 7. Indian,Pacific,Artctic..........
  4. 9. a very high hill
  5. 11. a very dry land
  6. 12. For example Australia
Down
  1. 2. an area of lower land between two lines of hills or mountains, usually with a river flowing through it
  2. 3. a large area of water, but not as big as an ocean
  3. 4. a tropical forest with tall trees that are very close together, growing in an area where it rains a lot
  4. 6. an area of water surrounded by land
  5. 8. a large mass of ice
  6. 10. an area of sand at the edge of the sea