Thousands of kilometers underground, it is very hot, so hot that the rock melts away from its organic state to its liquid state.
The liquid flowing from the rocks and mixing with different gases that the earth abounds in, forms magma.
The magma, an essential component in the formation of a volcano, travels tens of kilometers from the earth's surface, creating a pathway through the cracks caused by warming in the Earth's crust.
The accumulation of magma forms the magma chamber, which can remain at rest for decades, but under the effect of a large number of molten rocks, the magma pushes the ceiling to the surface and then turns into a volcanic eruption.
When it reaches the surface, the very hot magma in contact with much colder air becomes thicker and forms the lava that flows through the volcano and gradually cools and turns into rock.
The volcano can be on land or underwater.
It is very dangerous and quite destructive and examples in history are numerous...
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