Question 1

What does magma viscosity refer to?

Accepted Answer

The thickness or resistance of magma to flow

Answer

The amount of gas in magma

Answer

The temperature of magma

Answer

The speed at which magma cools

Question 2

How does temperature affect the viscosity of magma?

Accepted Answer

Higher temperatures decrease viscosity, making magma flow more easily.

Answer

Temperature has no effect on the viscosity of magma.

Answer

Lower temperatures decrease viscosity, allowing magma to flow more freely.

Answer

Higher temperatures increase viscosity, causing magma to flow slower.

Question 3

Why does high silica content in magma increase its viscosity?

Accepted Answer

Silica forms strong bonds that make the magma thicker and more resistant to flow.

Answer

Silica increases the density of the magma, causing it to flow faster.

Answer

Silica increases the temperature of the magma, making it more solid.

Answer

Silica forms complex molecular chains that make the magma more fluid.

Question 4

Which of the following best explains how magma viscosity influences the explosiveness ofa volcanic eruption?

Accepted Answer

High viscosity magma traps gases, increasing pressure and leading to more explosive eruptions.

Answer

Low viscosity magma traps gases, leading to explosive eruptions.

Answer

High viscosity magma allows gases to escape easily, resulting in less explosiveeruptions.

Answer

Magma viscosity has no effect on the explosiveness of an eruption.

Question 5

Which of the following combinations would result in the most viscous type of magma?

Accepted Answer

Low temperature, high silica content, and high gas content

Answer

High temperature, low silica content, and low gas content

Answer

High temperature, high silica content, and high gas content

Answer

Low temperature, low silica content, and low gas content

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