Knowledge Knowledge Knowledge

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Across
  1. 2. The process plants use to make food
  2. 4. Famous painting by Leonardo da Vinci
  3. 5. The capital city of Japan
  4. 6. Chemical element with the symbol 'O'
  5. 9. Largest planet in our solar system
  6. 10. The longest river in the world
Down
  1. 1. First president of the United States
  2. 3. The powerhouse of the cell
  3. 7. Currency used in the European Union
  4. 8. Author of "1984" and "Animal Farm"