Volcano eruptions

A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.

Volcanoes are generally found where tectonic plates are diverging or converging. Volcanoes are usually not created where two tectonic plates slide past one another.

Active of eruption , with those that erupt regularly called active, those that have erupted in historical times but are now quiet called dormant and those that have not erupted in historical times called extinct.

Scientists usually consider a volcano to be active if it is currently erupting or showing signs of unrest, such as unusual earthquake activity or significant new gas emissions. Many scientists also consider a volcano active if it has erupted in historic time

Extinct volcanoes are those that scientists consider unlikely to erupt again, because the volcano no longer has a lava supply. Examples of extinct volcanoes are many volcanoes on the Hawaiian islands in the U.S.

It is difficult to distinguish an extinct volcano from a dormant one because volcanoes are usually considered to be extinct if there are no written records of its activity. Many volcanoes may remain dormant for a long period of time and it is not uncommon for a so-called "extinct" volcano to erupt.

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