Geography China puzzle

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