Music, school and sports

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Across
  1. 2. Sport in a pool
  2. 4. Musical instrument with six strings
  3. 7. Instrument played with a bow
  4. 8. Sport on mountains
  5. 9. Science of matter
  6. 11. Study of the Earth
  7. 12. Game where players kick a ball into a net
Down
  1. 1. Instrument with black and white keys
  2. 3. Study of numbers
  3. 5. Game played with rackets and a ball
  4. 6. Study of past events
  5. 10. Team game played on ice