Blue group sort 19

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Across
  1. 3. To dig a hard substance
  2. 4. To be precise
  3. 6. Hole on the teeth
  4. 7. A piece of matter obtained by mining
  5. 8. Opposite of man-made
  6. 9. A natural gap between some rocks
  7. 10. To set alight
  8. 11. Air coming from the lungs
Down
  1. 1. person who breaches the law
  2. 2. Something to revise
  3. 4. A adjective that describes something that can please
  4. 5. The whole population of humans