Igneous Rocks

How are igneous rocks formed?

Intrusive and extrusive igneous rocks are classified based on what criteria?

What is required to generate an igneous rock with a fine-grained texture?

A phaneritic texture is characteristic of a(n) __________ igneous rock that cooled __________.

What does it mean if an igneous rock has an aphanitic texture?

What three components make up most magmas?

name two minerals that are unlikely to coexist in the same igneous rock.

Igneous rocks of felsic composition have __________ and __________ relative to mafic igneous rocks.

Which of the following is true about mafic igneous rocks?

You have found a mafic rock with a phaneritic texture. What is a potential rock name?

what minerals make up rhyolite?

Which mineral class makes up most igneous rocks?

Peridotite is the main constituent of which part of the Earth?

Which two minerals define a felsic composition?

What is one way a glassy texture forms?

Which of the following describes a texture containing bubble-shaped cavities?

Which of the following textures describes an igneous rock with anomalously large crystals?

What does an igneous rock with a pyroclastic texture tell a geologist?

Which of the following textures indicates two stages of cooling and crystallization?

Which of the following igneous rocks contains no mineral crystals?

What is the term used to describe a very large, widespread, and deep intrusive body of igneous rock?

In what type of igneous feature would you find rocks with a vesicular texture?

Working in the field, you see a thin, dark-colored igneous sill across the valley. Without seeing the sill up close, what texture would you expect it to possess?

Working in the field, you come upon a light-colored, fine-grained igneous rock that contains some very large dark-colored crystals. How do you account for this complex mineralogy?

Ultramafic rocks contain __________ and are commonly found in __________.

What is an accessory mineral?

Which of the following best describes the difference between granite and rhyolite?

What is the rock name of an intermediate rock with two distinct grain sizes?

What do pumice and scoria have in common?

At a subduction zone, melting is triggered by _____.

Which is the following statements best describes the relationship between pressure and melting point in the Earth's Interior?

What is the term used to describe increased temperature with depth in the Earth?

How can a magma body change its composition? CHOOSE ALL THAT APPLY.

________ describes how an entire suite of silicate minerals can form from a single basaltic magma as it cools and crystallizes.

Which mineral on the Bowen's Reaction Series will be the last to melt if an igneous rock is heated?

Which mineral on the Bowen's Reaction Series will be the first to melt if an igneous rock is heated?

Once a source rock partially melts, what does it produce?

According to Bowen's Reaction Series, __________ is one of the first minerals to melt, but last to crystallize.

How is basaltic magma transformed into felsic magma?

What causes an elevated geothermal gradient in a divergent plate setting?

In a subduction zone, water driven from subducted oceanic crust causes __________.

Which process is thought the generate most felsic magmas?

What is the term for a tabular igneous pluton that occurs in an orientation that is discordant with the bedding surfaces of adjacent sedimentary rocks?

What is the term for a tabular igneous pluton that occurs in an orientation that is concordant with the bedding surfaces of adjacent sedimentary rocks?

Which of the following terms is best described as a massive pluton?

Batholiths are known to form the cores of mountain ranges such as the Sierra Nevada. What is the implication of this observation?

While working in the field, you find a dike cutting across some sedimentary rocks. What grain size would you expect to find in this pluton?