The volcanoes of Hawaii form from thin, basaltic magma that tends to erupt quietly. What is one reason for the quiet eruptions?

A.
Basaltic magma allows dissolved gases to bubble upward and escape.

B.
Basaltic magma traps dissolved gases until the eruption.

C.
Basaltic magma is very viscous, especially at high temperatures.

D.
Basaltic magma is rich in silica, a mineral that releases gases.

The volcanoes of Hawaii form from thin, basaltic magma that tends to erupt quietly because basaltic magma allows dissolved gases to bubble upward and escape.

Explanation:

This kind of magma (basaltic) is low in silica content hence is not viscous. Due to this fact, the magma allows trapped gasses, such as sulfur dioxide, to bubble up and escape from the magma. This magma hence erupts quietly and flows on the surface for greater distances before cooling into rock.

On the contrary viscous (felsic) magma, with high silica content, does not allow trapped gasses to easily escape. This causes a build-up of pressure. At the surface of the crust, this pressure suddenly releases causing an explosive magma eruption. This kind of magma also cools very fast upon coming to the surface.

Learn More:

For more on felsic and basaltic magma check out;

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