Geographical features

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Across
  1. 3. "Crocodiles live here"
  2. 6. "A tract of land completely surrounded by water"
  3. 7. "natural elevation of the earth's surface"
  4. 10. "Cascade"
  5. 11. "Rocks along the seashore"
  6. 12. "Depression between mountains"
Down
  1. 1. "Bigger than the sea"
  2. 2. "It is dark"
  3. 4. "An area of land almost completely surrounded by water exept for an isthmus"
  4. 5. "The side or slope of a hill"
  5. 8. "Little river"
  6. 9. "Extended mass of ice"