Understanding Magma Types

The video tutorial explores different types of magma, focusing on their viscosity, temperature, gas content, and silica content. It explains how these factors influence the explosiveness of volcanic eruptions and the formation of volcanic cones. The tutorial also discusses the formation locations of basaltic, andesitic, and rhyolitic magmas, highlighting their unique characteristics and behaviors.

What is the primary role of magma in volcanic activity?

• To create earthquakes

• To form oceanic trenches

• To determine the explosiveness of a volcano

• To cool the Earth's surface

Which type of magma has the lowest viscosity?

• Granitic magma

• Rhyolitic magma

• Andesitic magma

• Basaltic magma

How does temperature affect the viscosity of magma?

• Higher temperature increases viscosity

• Temperature has no effect on viscosity

• Lower temperature decreases viscosity

• Higher temperature decreases viscosity

Which type of magma is associated with the highest temperature range?

• Basaltic magma

• Andesitic magma

• Rhyolitic magma

• Granitic magma

What is the relationship between gas content and explosiveness in magma?

• Higher gas content leads to less explosive eruptions

• Lower gas content leads to more explosive eruptions

• Higher gas content leads to more explosive eruptions

• Gas content does not affect explosiveness

Which type of magma has the highest gas content?

• Rhyolitic magma

• Granitic magma

• Andesitic magma

• Basaltic magma

How does silica content affect the viscosity of magma?

• Lower silica content increases viscosity

• Silica content has no effect on viscosity

• Higher silica content increases viscosity

• Higher silica content decreases viscosity

Which type of magma has the highest silica content?

• Rhyolitic magma

• Andesitic magma

• Basaltic magma

• Granitic magma

What is the effect of higher silica content on volcanic eruptions?

• It reduces the temperature of eruptions

• It has no effect on eruptions

• It makes eruptions more explosive

• It makes eruptions less explosive

Where is basaltic magma typically formed?

• In oceanic crust only

• In continental crust only

• In both oceanic and continental crust

• In subduction zones only