Exam 4: Igneous Rocks and Intrusive Activity

What magma- generating process is exhibited by the diagram below? When does this process take place?

Extrusive igneous rocks are typically finer grained than intrusive igneous rocks. Why?

What do pumice and obsidian have in common?

Which of the following igneous rocks exhibit aphanitic texture?

A(n)________texture represents a single, long period of cooling and crystallization.

Which of the following are used for studying rocks with a polarizing microscope?

Consider Bowen's reaction series. Which mineral would you expect to see as a phenocryst in a porphyritic basalt?

Technically, the process whereby ions arrange themselves into orderly patterns during the cooling of a liquid is called________ .

________is the name given to molten rock below the Earth's surface.

Which of the following minerals crystallize early in Bowen's reaction series?

Which of the following best describes an aphanitic texture?

All of the following are factors that affect the generation of magma EXCEPT for _________ .

Which igneous rock or magma has the lowest silica (SiO₂ )content?

________is the dominant lava erupted from volcanoes on Hawaii and Iceland.

A(n)________texture refers to rocks composed mainly of mineral and volcanic fragments.

In a porphyritic volcanic rock, which mineral grains are the last to crystallize?

The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a ________composition.

In a series of basaltic lava flows on Hawaii, the top and bottom of each flow is difficult to distinguish just by looking at the layers of rock. What are some rock characteristics (texture, mineralogy, etc.)and other features that you might use to recognize individual lava flows?

Changing the composition of magma by incorporating surrounding host rock is known as________ .

________is characterized by very coarse mineral grains.