Pres­sure equal­iza­tion from Earth’s in­te­rior

The heart of an ac­tive vol­cano is a cham­ber of molten rock, or magma. An erup­tion be­gins, when the pres­sure in the cham­ber is so in­tense that the magma is forced to­wards the sur­face, where it will typ­i­cally dart out of the crater.

Science Illustrated - - NATURE -

The molten rock is up to 1,200 °C hot, as it flows out of the vol­cano. When the magma reaches Earth's sur­face, it is cooled.

The flow stops, when the magma has cooled to about. 800 °C. Hard­ened magma is known as lava. It is of­ten por­ous due to small pock­ets, from which the gas of the magma es­caped.

Magma shoots out of the vol­cano crater due to the high pres­sure from the un­der­ground. Small balls of fire (vol­canic bombs) fly in all di­rec­tions.

One of the most ac­tive vol­ca­noes in the world is lo­cated on the French is­land of Réu­nion in the In­dian Ocean.

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