Question 12.1

On Earth’s surface as a whole, what process generates the greater volume of volcanic rock, decompression melting or fluid-induced melting? Which of these processes creates the more dangerous volcanoes?

Question 12.2

What is the difference between magma and lava? Describe a geologic situation in which a magma does not form a lava.

Question 12.3

What are the three major types of volcanic rocks and their intrusive counterparts? Is kimberlite one of these three types?

Question 12.4

What type of volcano is the Arenal volcano, shown in Figure 12.10?

Question 12.5

Most volcanism occurs near plate boundaries. What type of plate boundary can produce large amounts of rhyolitic lavas?

Question 12.6

What evidence suggests that the Yellowstone volcano was produced by a hot spot?

Question 12.7

How do scientists predict volcanic eruptions?