Question

What are the causes of volcanic eruption? Answer in detail.

Answer 1

When one is pushed under the other the magma, sediment and seawater is forced into the chamber which eventually overflows and the volcano erupts spewing lava into the sky.

This kind of eruption produces sticky, thick lava at temperatures from 800 to 1,000C.

The second type of eruption caused by tectonic plates is  when the plates move away from each other allowing magma to rise and fill the the gap, which can cause a gentle explosion of thin lava of temperatures between 800 to 1,200C.

Decreasing temperatures can cause old magma to crystallise and sink to the bottom of the chamber and this movement can force fresh liquid magma up and out - similar to dropping a brick in a bucket of water.

Finally a decrease in external pressure can trigger an eruption as it may minimise the volcano's ability to hold back by increasing the pressures inside the magma chamber.

This kind of eruption can be caused by natural events such as typhoons, which decrease rock density, and glacial melting on the top of the volcano which alters the molten rock composition.

Answer 2

The causes of volcanic eruption:

Explanation:

• The core of the earth consists of hot magma.
• This hot magma sometimes may reach the crust of the earth.
• This occurs through holes or cracks present in the crust.
• The hot magma in the form of magma gushes out through the surface of the earth.
• This may be active fissures or maybe dormant where there was leakage of magma earlier.
• As the pressure of the surface of the earth changes the volcano takes place.