A volcano is an opening, in our planet’s crust, which allows hot magma (lava), ash, cinders,dust and hot gases to escape from below the surface. The Volcanoes are generally found where some plates of the earth are diverged or converged.  By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the earth’s crust.Volcanoes can also be caused by mantle plumes.

Through years  a mountain is formed which is  topped with vents, holes, and craters. When the volcano erupts, magma (lava), ash, cinders, dust, and hot gases can pour out the top. Magma (when it’s deep in the ground) or lava (when it reaches the earth’s surface) is very hot, liquid rock. When the lava cools down, it turns into hard rock. Ash is a grey powder that results from material being burned in the volcano. Ash can be carried in the air for many miles.

There are four types of volcanoes: active, erupting, dormant, and extinct. An active volcano is a volcano that has had at least one eruption during the past 10,000 years.

An erupting volcano is an active volcano that is erupting.

A dormant volcano is an active volcano that is not erupting, but it may erupt again.

An extinct volcano is a volcano that hasn’t had an eruption for at least 10,000 years and is not expected to erupt again. 
Volcanoes can occur on land or in the water.

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