The amount of silica present in a magma influences how explosive a volcanic erup

Question

The amount of silica present in a magma influences how explosive a volcanic eruption is because:

Question 1 options:

It governs the type of gas species that are present and some gases are more explosive than others

It governs the type of mineral crystals that form and the more silica-poor minerals have a higher kinetic energy of formation than the more silica-rich minerals

It governs the viscosity of the magma and more viscous magma traps more gas, raising the pressure in the magma chamber

It governs the temperature of the magma and the hotter the magma the more explosive it becomes

a)

It governs the type of gas species that are present and some gases are more explosive than others

b)

It governs the type of mineral crystals that form and the more silica-poor minerals have a higher kinetic energy of formation than the more silica-rich minerals

c)

It governs the viscosity of the magma and more viscous magma traps more gas, raising the pressure in the magma chamber

d)

It governs the temperature of the magma and the hotter the magma the more explosive it becomes

Explanation / Answer

Solution :-

It governs the viscosity of the magma and more viscous magma traps more gas, raising the pressure in the magma chamber.

The character of volcanic eruptions are largely controlled by the viscosity .

Low viscosity magmas allow gases to escape easily whereas gas pressures can build up in high viscosity magmas - resulting in violent eruptions

c)

It governs the viscosity of the magma and more viscous magma traps more gas, raising the pressure in the magma chamber.

The character of volcanic eruptions are largely controlled by the viscosity .

Low viscosity magmas allow gases to escape easily whereas gas pressures can build up in high viscosity magmas - resulting in violent eruptions

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