Volcanoes & Mountain Building Test Practice

Underground igneous rock bodies are called

• lava flows.

• plutons.

• volcanoes.

• calderas.

The greatest volume of volcanic material is produced by

• eruptions of cinder cones.

• eruptions of composite cones.

• eruptions along ocean ridges.

• eruptions of shield volcanoes.

The most explosive type of volcanic activity is associated with

• cinder cones.

• sills.

• composite cones.

• shield volcanoes.

A magma’s viscosity is directly related to its

• depth.

• age.

• color.

• silica content.

What are the pulverized rock, lava, ash, and other fragments ejected from the vent of a volcano called?

• sills

• craters

• pahoehoes

• Pyroclastic material

Which type of volcano consists of layers of lava flows and pyroclastic material?

• composite cone

• cinder cone

• shield volcano

• laccolith

The hotter of two types of basaltic lava commonly forms

• aa flows.

• pahoehoe flows.

• pyroclastic flows.

• lapilli flows.

What is the very large depression at the top of some volcanoes called?

• a vent

• a lava plateau

• a volcanic neck

• a caldera

When silica-rich magma is extruded, ash, hot gases, and larger fragments propelled from the vent at high speeds may produce which of the following?

• a lava plateau

• a lahar

• a pahoehoe flow

• a pyroclastic flow

What feature may form in an intraplate area over a rising plume of hot mantle material?

• a hot spot

• a dike

• a subduction zone

• an ocean ridge