Greek 'ph' words

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Across
  1. 2. you sing into this
  2. 3. it shows information in a pictoral form in maths
  3. 7. active
  4. 9. a type of scam
  5. 10. a 3d shape with a continuous curved edge
Down
  1. 1. a subject about our Earth
  2. 4. a game bird with long feathers
  3. 5. a marine mammal
  4. 6. letters
  5. 8. digraphs and trigraphs