A volcano is a rupture on the crust of planetary mass object,Such as Earth, whitch allows hot lava, volcanic ash, and gasses to ecscape from the Magma Chamber below the surface.
A Dormant volcano is a volcano that is active Volcano thats not erupting,but supposed to erupt again sometime.Dormant means that the volcano is in a deep sleep.
An active Volcano is a volcano that has had at least one eruption during the past 10,000.An active volcano might be erupting or dormant.
Volcanos have been pictured violently assaulting the Earth and life around them since the earliest times.
this picture was found from http://www.basicplanet.com/