Exam 12: Volcanoes

One of the world's largest suppliers of natural steam is _________ located north of San Francisco.

Approximately 80 percent of Earth's active volcanoes occur _______ plate boundaries?

Which of the following volcanoes is most likely to contain pillow lava?

Huge mudflows made up of wet volcanic debris are called

During volcanic eruptions pieces of the country rock wall can be broken off and brought up in the eruption.Which deposit is most like to contain such fragments?

Approximately what fraction of magma that is generated in the mantle makes it to the surface?

Over the past 2000 years,which of the following volcanic hazards has caused the most fatalities?

What type of rock makes up the Columbia Plateau of Oregon and Washington?

What is the eruption temperature of basaltic lava?

One hypothesis proposes that large igneous provinces form at hot spots by mantle plumes that originate at what boundary within Earth?

In which of the following tectonic settings do most of Earth's active volcanoes occur?

Yellowstone,in Wyoming,is an example of a

Magma generated in Earth's interior rises because it is ______ than the surrounding rocks.

The eruption of vast quantities of superheated steam is called a

Small vents on volcanoes that emit gas fumes and steam are called

The Laki eruption of 1783 in Iceland is considered the ______ in recorded history.

Why is volcanic ash considered dangerous to jet airplanes?

What type of volcanic gases form aerosols in the upper atmosphere that can cause global cooling?

Which of the following eruptions would be classified a phreatic eruption?

What percentage of Earth's active volcanoes occurs at divergent plate boundaries?