ph and gh as /f/

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Across
  1. 6. a 3D shape
  2. 8. a device to take pictures or make calls
  3. 9. when two letters combine to make one sound
  4. 10. a picture made by using a camera
  5. 11. you should cover this with your sleeve
  6. 13. the moon goes through these
Down
  1. 1. the collection of 26 letters in the english language
  2. 2. a highly intelligent mammal
  3. 3. an diagram that shows the relation between 2 areas
  4. 4. when 3 letters combine to make one sound
  5. 5. a small rodent with large teeth that likes to burrow
  6. 7. an award given to the winner
  7. 10. the study of matter and energy
  8. 12. the largest land mammal