Exam 6: Volcanoes and Igneous Rocks

Sulfur dioxide,which is released during volcanic eruptions,forms small droplets in the atmosphere called _______.

According to the table below,darker colored igneous rocks result from a(n)_______ in silica.

The mass of bubbles found in pumice are more commonly known as _______.

_______ are volcanic vents that emit only gas.

Which of the following is the name for a fine-grained,felsic igneous rock?

Pumice forms from the slow cooling of lava that froths and bubbles.

When magma re-enters a magma chamber causing the floor of the caldera or crater to lift,the resulting structure is called a _______.

According to the figure below,the temperature of oceanic crust does not exceed _______?

The figure below has what type of texture?

When lava rises to the surface through long fissures rather than a crater,the resulting formation is a broad,flat lava plain called a(n)_______.

An extinct volcano shows no signs of activity.

A separation of melted materials from remaining solid materials during the course of melting is known as crystallization.

The igneous rock in the figure below has what type of texture?

Which of the following terms best describes the lava in the figure below?

Large,loose pyroclasts welded together during an eruption are known as _______.

The Hawaiian Islands are composed of what type of volcanoes?

_________is an example of a mafic,plutonic igneous rock.

The texture of igneous rocks that contain large crystals set in a finer matrix is known as _______.

The ejecta from a volcano are collectively known as tephra.

What are flood basalts?