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A dormant volcano is a volcano which isn't currently active (that is, not erupting nor showing signs of unrest), but is believed to be still capable of erupting. This contrasts with an extinct volcano, where it's believed that no eruptions will occur for the foreseeable future. The term is also used to refer to dormant volcanic fields such as the Auckland volcanic field.
   In practice, it's often impossible to distinguish between a dormant and an extinct volcano and several volcanoes thought to be extinct have subsequently re-erupted. Volcanoes can be dormant for hundreds or thousands of years and, due to the lack of eruptions, are usually eroded and worn down. The eruptions from a dormant volcano are usually very violent because the plug inside the volcano stops the lava from coming out of the vent for a very long time, thus building pressure. The volcano will then erupt again and be classified as an active volcano.
   The volcano can be referred to as "asleep," since it isn't expected to erupt anytime in the near future, but it's said to erupt soon, within the next 100 years. It is quite possible, however, that the volcano will eventually be active again. Dormant volcanoes sometimes have hot springs and fumarolic activity, when steam and hot volcanic gases, such as sulfur dioxide, are emitted.

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