Exam 5: Volcanoes and Volcanic Hazards

Which of the following lavas make up 90 percent of the total volume of lava on Earth?

How does a volcanic neck form? What happens to the rest of the volcano that originally surrounded it?

What materials make up a pyroclastic flow?

Kilauea, a volcano in Hawaii, generates fluid, extensive lava flows.Mount St.Helens, a volcano in Washington State, can produce lava flows that are short and thick, but that can also erupt violently and generate large volumes of ash.What might these differences indicate about each lava's silica content and temperature?

The volcanic islands visible here formed as a result of a mantle plume.Which volcanic island is the oldest and subsiding into the sea?

How is this chain of volcanic islands forming?

Composite cones are famous for their conical shapes with steep summits, sloping flanks, and broad base.How might the composition of eruptive materials have changed for the volcano to transition from something with a broad base to something with a smaller base and steeper slopes?

Explain what will happen to the flanks of the volcano as magma moves into the magma chamber.

What is the difference between a quiescent and an explosive eruption?

Which of the following choices best explains the difference between a crater and a caldera?

The volcanic islands visible here formed as a result of a mantle plume.Researchers working on these volcanic islands have collected basalt samples for potassium-argon dating to determine when these islands formed Volcanic Island A has been dated to 7.6 million years ago.Volcanic Island C dates back to 3.4 million years ago and is 200 km away from A.Using the equation Rate = Distance/Time, calculate the rate of plate motion for this region.

GPS units, satellites, and lasers are some of the tools used to monitor the ________ of the volcanic flanks, which indicates magma accumulating in the magma chamber.

Which of the following is not a method of caldera formation?

A ________ is a cone-shaped structure created by successive eruptions of volcanic materials such as lava or pyroclastic materials.

Which type of magma(s)will produce scoria?

What interpretations can be made about the maturity of a volcano where most eruptions occur from basal fissures and there are a number of parasitic cones along the volcano's flanks?

What is the importance of monitoring volcanic activity? Why should we pay attention to what volcanoes are doing?

Based on the information visible, what kind of volcano is this?

What substances are emitted from fumaroles?

What kind of volcano is most closely associated with pyroclastic flows?