Geography, 13.07.2019 11:00 kingyogii

Why is volcanism associated with regions where one plate descends below another plate?

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That is because volcanism, namely the fissure eruption and vokcanic eruption, is caused due to the subduction of plate.

By plate tectonics, in the destructive boundaries of plates, the denser oceanic plate will subducts under the less dense continential plate under the sinking convection current of magma.

During the process, cracks are formed due to pressure. The magma will then rise along the crack to cause fissure eruption and cools down. As the process of eruption and cooling repeat, a volcano will be formed, hence causing volcanic eruption.

Another thing is that as the subducted plate melts under the extreme heat of magma, extra material for magma is provided which caused eruption to happen more likely.

Hope it helps!

Answer from: makaylarae8781

Movement of the plates below the other plates will cause cavities in the outlet of the magma from the bowels of the earth.

Explanation:

There are several types of tectonic plate movements, namely Divergent, convergent and Transform.

Divergent is the movement of two plates that move away from one another

Convergent is the movement of two plates that are close together or collide

Transform is the movement of two plates rub against each other.

Of the three types of plates that are most likely to form volcanoes are convergent. Converging subduction type is a movement where the two plates that come close to each other or collide make one of the plates move below the other plate. The result is the emergence of channels that can be used by magma to get out to the surface of the earth so that the appearance of volcanoes. The easiest examples are along the islands of Java, NTT, NTB, Bali, Sumatra to Papua in Indonesia. So that many volcanoes are found in Indonesia as a result of the convergence of the Asian plate with Australia.

Learn More

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Details

- Grade : Senior High

- Subject : Geography

Keywords

- Volcanism

- Convergent

- Subduction

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