Why are the clouds so high in the sky?

Question: Why are the clouds so high in the sky?
- Keywords:
  cloud,
  high,
  sky,
  weather
Asked by reanna12 to Jools on 22 Jun 2011.
- Julie Greensmith answered on 22 Jun 2011:
  
  I think that this is to do with atmospheric pressure being high which pushes the clouds to the upper atmosphere…….not really sure as I dont study clouds!

Question: Why are the clouds so high in the sky?