Question

Which of the following is not typically associated with explosive volcanic eruptions?

1) high gas content in magma
2) high magma viscosity
3) mafic magma composition
4) convergent plate boundaries
5) tuff

Answer 1

Explosive volcanic eruptions are typically associated with high gas content in magma, high magma viscosity, and convergent plate boundaries. Mafic magma composition is typically associated with non-explosive eruptions.

Step-by-step explanation:

Explosive volcanic eruptions are typically associated with high gas content in magma, high magma viscosity, and convergent plate boundaries. These eruptions are characterized by the ejection of ash, lava bombs, and pyroclastic flows. Mafic magma composition, on the other hand, is typically associated with non-explosive eruptions.

Examples:

• In 1980, the eruption of Mount St. Helens in the United States was an explosive eruption caused by the release of high-pressure gas from the magma chamber.
• In contrast, the eruption of Kilauea in Hawaii, which is characterized by low viscosity and low gas content, produces non-explosive lava flows.
• At convergent plate boundaries, such as the Ring of Fire, subduction zones often lead to explosive eruptions due to the interaction of water and magma.