BJU Earth Science Chapter 8

The depression found at the top of most volcanic cones is called

Which of the following volcanic structures is the most common?

A depositional mountain built up by molten rock that has risen to the earth's surface.

Volcano that emits mostly lava in quiet eruptions

Tiny, angular, glassy fragments emitted from volcanoes

What is expelled from a volcano in gaseous emission?

The VEI scale rates volcano activity only on the basis of volume of rock discharged eruption

Large amounts of magma that collect and harden in chambers underground are known as _______.

Flood basalts or basalt traps are

a volcano begins to form when magma forces its way to the surface and breaks through, forming a hole or ____

A'a' lava looks like a thick, smooth rope when it hardens.

A mudslide caused by a volcano is called....?

Volcano that emits mostly cinders, ashes, and bombs

Streamlined mass of ejected lava that solidified in flight

Which of the following is NOT a term related to a volcano's activity?

Vertical is to dike as horizontal is to

When water heated underground rises to the surface as a liquid, it forms a

Which is NOT expelled from a volcano in solid emission?

A scale that geologists use to classify the destructiveness of a volcanic eruption is called the _______?

magma that reaches Earth's surface

Volcano that emits lava and solid debris in alternating eruptions:

Depression found at the top of most volcanic cones

The term tephra is used to describe lava that has cooled and solidified on the ground.

A _______ is a hot spring that erupts periodically.

Secular geologists believe that most of the earth's internal heat comes from

Rapid, downhill movement of hot, solid, particles in steam:

What Type of Rock is a Volcano

Pahoehoe is

an enlarged depression that is caused by an explosion or the collapse of a volcanic cone

Pillow lava forms

A volcano having no historical record of eruption.