English crossword

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Across
  1. 4. Usually used to carry something on your back.
  2. 6. A subject where you learn about plants and animals.
  3. 7. Used for listening music without disturbing others.
  4. 9. A subject where you learn about events in the past.
Down
  1. 1. Spending time playing games.
  2. 2. Very, very small.
  3. 3. A place where you eat at school.
  4. 4. Take something and then give it back.
  5. 5. Unit for describing distance used in most of the countries, that consists of 1000 smaller units.
  6. 8. A flying machine used to travel.