Volcanic arcs

Question 1

What type of tectonic setting forms a volcanic arc?

Answer 1

Subduction zone

Question 2

What causes the generation of magma above subduction zones?

Answer 2

Metamorphic dehydration reactions in the subducted slab

Question 3

What type of magma is typical at subduction zones and is responsible for explosive eruptions?

Answer 3

Andesitic

Question 4

Which volcanic hazard is most deadly due to its speed, heat, and unpredictability?

Answer 4

Pyroclastic flows

Question 5

The Nevado del Ruiz eruption in 1985 is notable because:

Answer 5

Authorities ignored warning signs, resulting in massive loss of life

Question 6

What type of fault movement is associated with the largest earthquakes at subduction zones?

Answer 6

Thrust faulting

Question 7

Which of the following is not a primary volcanic hazard?

Answer 7

Earthquakes

Question 8

What measurement reflects the energy released during an earthquake?

Answer 8

Richter Magnitude

Question 9

Why are ridges and oceanic island volcanoes generally less explosive?

Answer 9

Their magma has low gas content and low viscosity

Question 10

What is one major limitation in earthquake science?

Answer 10

We can’t predict earthquakes precisely