why do domes not collapse?

Question: why do domes not collapse?
- Keywords:
  collapse,
  dome
Asked by periodictable.com to Andres, Andy, Emma, Shahil, Sheryl, Zoe on 13 Mar 2017.
- Emma Ryan answered on 13 Mar 2017:
  
  The forces are all balanced.
- Andres Rivero answered on 13 Mar 2017:
  
  Hi trebleclef.com,
  
  Like Emma says, domes are ones of the most efficient constructions in terms of distributing the loads. Their spherical shapes allow them to handle heavy loads and transfer them to the base quite efficiently.
  
  Andres
- Zoe Lonsdale answered on 14 Mar 2017:
  
  Sometimes they do.
  Wikipedia has a very good article in the characteristics section.
  https://en.wikipedia.org/wiki/Dome

Question: why do domes not collapse?