Population(in Millions)
   Zero Population
   <10
   10-30
   30-60
   60-100
   100-200
   >200-1000
   >1000

Volcanoes
    Shield
    Stratovolcano
    Caldera
    Submarine
    Complex Volcano
    Dome
    Cinder Cone
    Pyroclastic Cone
    Maar
    Volcanic Field
    Plug
    Somma Volcano
    Fissure vents
    Tuff Ring
    Unknown