Ishan crossword puzzle

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Across
  1. 3. largest country by population in Africa
  2. 5. largest country by population in Europe
  3. 8. sea beach in Chennai
  4. 9. a city in Turkey
  5. 10. last name of human
  6. 11. hormone produced by pancreas
  7. 12. gas which can also be produced from cow dung
  8. 15. without this gas fire can not sustain
Down
  1. 1. last name of mango tree
  2. 2. a disease for which MMR vaccine is used
  3. 4. unit of sound
  4. 5. second name of china rose
  5. 6. 13th element in periodic table
  6. 7. two numbers not sharing any common factor other than 1
  7. 8. a port city of Karnataka named after Devi Mangala
  8. 13. largest bone in human lower leg
  9. 14. 10th element in periodic table