ICSE Class 9 Answered
Explain in brief , how a volcanic eruption is caused.
Asked by sanu123736 | 07 Jun, 2015, 02:43: PM
Expert Answer
Volcanic activity frequently occurs at the boundaries of the Earth's tectonic plates which are a series of large blocks moving between each other. The movement of these plates plays a significant role in the type of volcano formed, which influences its shape.Under the surafce of the earth, exists the Magma chamber. Magma is the molten rocks. When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged. Although there are several factors triggering a volcanic eruption, three predominate: the upward force exerted by the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber. This magma is forced upwards through a vent or the pipe of a volcano. It then reupts and send huge amount of lava, smoke, dust, gases and ash on the surface of the Earth.
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