what would happen if yellowstone volcano errupted

Question: what would happen if yellowstone volcano errupted
- Keywords:
  earth,
  environment,
  natural disaster,
  volcano
Asked by chaza433 to Angela, Claire, Ian, Robert, Sarah on 13 Nov 2014. This question was also asked by Kim-Jommy-un.
- Angela Stokes answered on 13 Nov 2014:
  
  I guess it would spew ash for thousands of miles across the USA – but as it has only happened three time ever and the last time was over 660,000 years ago I don’t think we need to worry too much.

Question: what would happen if yellowstone volcano errupted