Igneous Rocks and Magma Quiz

What type of texture of igneous rocks is characterized by large, visible crystals?

Which type of magma is associated with higher temperatures, lower viscosity, and darker colors?

Where would you expect to find basaltic magma forming?

How is magma typically generated?

Which tectonic environment would likely produce andesitic magma?

What is the process that leads to the formation of granitic magma?

What is the primary factor that determines the viscosity of magma?

What type of volcanic eruption is characterized by a violent explosion and the ejection of rock fragments?

What type of volcanic feature forms when the summit of a volcano collapses into the emptied magma chamber below?

How does magma composition influence volcanic eruption styles?

What term describes a volcanic rock texture with both large and small crystals?

Which type of magma has the highest silica content?

Which type of volcanic eruption is not driven by lava but by steam resulting from the interaction of water with hot rocks or magma?

What is the primary gas released during volcanic eruptions?

What is the approximate average geothermal gradient in the Earth's crust?