Geography China puzzle

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Across
  1. 5. - a main river in China
  2. 6. - largest desert in Asia ??
  3. 9. - one of the plains in China
  4. 10. - topic
  5. 11. - One of the tallest mountains in the world
  6. 12. - it’s hard to cross the walls of China
  7. 16. - A set of mountains like Himalaya mountain
  8. 17. - one of the main 2 rivers in China
  9. 18. - a main sea of China
  10. 19. - it’s hard to cross the walls of China
  11. 20. - A wall of mountains
Down
  1. 1. - It helped the Chinese to grow better than other civilizations
  2. 2. - helped to protect it against invaders
  3. 3. - a place higher than normal land height
  4. 4. - even if the rivers bring destruction people still live around the rivers because of the land
  5. 7. - a sea in china
  6. 8. - Although it helped china to make fertile soil it is also a disaster as it floods the places around it
  7. 13. - Largest desert in China??
  8. 14. - it helped the Chinese to have fertile soil and we’re able to grow crops and keep livestock
  9. 15. - low in the east and high in the west