General Knowledge Crossword Puzzle

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Across
  1. 4. Shape with three sides and three angles
  2. 6. Author of 'The Adventures of Sherlock Holmes'
  3. 7. Largest country in the world
  4. 8. City known as the cultural capital of Sri Lanka
Down
  1. 1. Largest mammal on Earth
  2. 2. River that flows through Egypt
  3. 3. Capital city of Australia
  4. 5. Which planet is Known as the 'Red Planet'