do you know your cloud words?

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Across
  1. 2. clouds with an altitude of 6500-20000
  2. 5. thin, high altitude, whispy clouds
  3. 9. big, puffy, gray clouds bringing rain
  4. 10. the height of the cloud
  5. 11. thick, puffy, blue gray blanket like clouds
Down
  1. 1. clouds with an altitude of 20000-43000
  2. 3. clouds with an altitude of ground-6500
  3. 4. thick layered clouds looking like blankets
  4. 6. puffy clouds that you cab see shapes in
  5. 7. the route word meaning "rain"
  6. 8. dark heavy water droplet clouds