Question

2. What causes volcanic eruptions?​

Answer 1

Answer:

Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth's mantle melts. ... If magma is thick, gas bubbles cannot easily escape and pressure builds up as the magma rises. When the pressure is too much an explosive eruption can happen, which can be dangerous and destructive.

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Answer 2

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The buoyancy and pressure of the gas within the earth's crust cause a volcano to erupt. Magma is formed when the upper mantle of the earth melts. A volcano erupts when the magma (the hot liquid) rises upwards by the pressure of gas that is dissolved in it. This is one of the three predominant theories.

According to the second theory, magma contains dissolved substances such as water, sulfur dioxide and carbon dioxide. The solubility of the gases is high as the pressure increases. The solubility of water decreases as the magma moves closer to the earth's surface and eventually separates from the magma.When the ratio of the gases becomes more in magma it causes the magma to disintegrate into pyroclasts, a combination of partially molten and solid fragments, and the volcano erupts explosively. 

The third theory says that a volcano erupts when new magma is injected into a chamber that is already brimming with magma of similar or different compositions. The eruption occurs when the magma moves upwards due to the additional push exerted by the injection of new magma. 

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