Volcanoes in the world have been classified into the following main types on the basis of their period of eruption:
1. Active or Awake Volcanoes: These types of volcanoes erupt frequently. Etna and Stromboli volcanoes of Italy are active volcanoes.
2. Dormant Volcanoes: These volcanoes erupt again after remaining dormant for some time. Vesuvius of Italy is the same type of volcano, which has erupted in the years 1631, 1812, 1906 and 1943.
3. Extinct Volcanoes: Those volcanoes which have not erupted since a long time period and in which water, etc. has filled up are known as extinct volcanoes. Mount Popa in Myanmar and Koh-E-Sultan in Iran are extinct or dead volcanoes.
