Geography China puzzle

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