Exam 6: Volcanoes: Tectonic Environments and Eruptions

What are the main distinctions between basalt and rhyolite? Compare them based on color,silica content,relative viscosity,relative explosiveness,and the most abundant gas in each.

Which of the following statements about basalt is NOT true?

What can cause water to separate from a water-bearing basaltic magma to drive an eruption?

What are the two most abundant gases in magmas?

If you see a large,steep-sided volcano in the distance,what type of volcano is it and what is the rock composition?

What causes a big bulge to slowly grow on the flank of an active Cascades volcano?

About how far can a pyroclastic flow travel?

List and describe the types of tectonic environments where volcanic eruptions take place.

If you see in the distance a small,steep,smooth-sided volcano,what type of volcano is it and what is it likely made of?

A large,steep-sided volcano is likely made of what composition of rock? In what form was the rock erupted? What type of volcano is it?

If you see an extremely large volcano with very gentle slopes,what kind of a volcano is it and what rock is it likely made of?

A rhyolite magma typically erupts in what form?

Which of the following statements about volatiles is true?

Eruptions dominated by basalt compositions are found where?

Why do landslides sometimes trigger explosive eruptions?