3-star crossword puzzle

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Across
  1. 3. longest river in Australia
  2. 4. cook a British explorer
  3. 8. red sandstone rock
  4. 9. largest desert in the world
  5. 10. biggest coral reef in the world
  6. 11. sea with coral covering the bottom
  7. 12. a place where prisoners are sent to work
Down
  1. 1. the type of government which the leader is not elected
  2. 2. leader of Australia
  3. 5. in capital of Australia
  4. 6. a inhabitant of Australia
  5. 7. second largest desert in the world