Because _____ magmas are the most viscous they are associated with the most violent eruptions.
A) silica-rich
B) iron-rich
C) carbon dioxide-rich
D) water-rich
E) older

Question

Quizplus · Accepted Answer

Silica-rich magmas have a higher viscosity due to the presence of silica, which forms strong chemical bonds with other elements in the magma. This high viscosity means that gas bubbles cannot easily escape from the magma, leading to pressure build-up and explosive eruptions. Iron-rich, carbon dioxide-rich, and water-rich magmas can also contribute to explosive eruptions, but not to the same extent as silica-rich magmas. The age of the magma (option E) is not directly correlated with its viscosity or eruption style.

Because _____ Magmas Are the Most Viscous They Are Associated