Across

1. Mark left after cut heals

3. Solid

6. Look closely

9. Illegal operation

11. Sick

12. Hopping amphibian

13. Low female singing voice

14. Headwear

15. Gab

17. Carve into

20. Ridge of rock in sea

21. Pointy tooth

 Down

1. Drips from trees

2. How old you are

4. Incorporated (abbr.)

5. Mother

7. Our planet

8. Not left

9. A layered stone

10. Top floor of a house

15. Vehicle

16. Had eaten

18. A hot drink

19. Pig