Exam 4: Magma, Igneous Rocks, and Intrusive Activity

What magma forms from the partial melting of mantle material?

Is the rock in the above image intrusive or extrusive?

Refer to the scenario above.Assuming a temperature of 20°C at the ground surface, what is the temperature at a depth of 2 miles?

How could a researcher use magmatic differentiation to determine if a batholith is the result of one body of magma cooling and crystallizing or multiple bodies of magma?

In July 1863, Union and Confederate forces fought in a three-day battle at Gettysburg, Pennsylvania.The Confederate position was on Seminary Ridge, an igneous dike.The Union position was on Cemetery Ridge, an igneous sill.Using what you know about the history of the battle, interpret how the geology of the battlefield aided the Union victory.

Which of the following regions will primarily erupt silica-rich lavas?

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

Peridotite that undergoes partial melting will create a melt enriched in ________.

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

Which of the following statements best describes the formation of secondary magmas?

Why would rhyolite deposits be less common than granite deposits?

Which of these textures help geologists determine if a rock is of intrusive origin?

The granitic igneous rocks that make up the Sierra Nevada Mountains in California and Nevada are ________.

What is the definition of magma mixing?

What is the role that depth can play on cooling and crystallization of igneous rocks?

If an igneous rock is heated, which mineral melts first according to Bowen's reaction series?

Where do ultramafic rocks form?

When teaching about igneous rocks, one trick instructors often implement to help students determine the igneous composition of the samples is to use the color of the rocks as a guide.Explain how the color of an igneous rock can often be used as an indicator of its igneous composition.Be sure to reference specific minerals for each composition.

What substance makes ion migration easier in the later stages of magma crystallization, which allows abnormally large mineral crystals to form and create pegmatites?

Igneous rocks with an andesitic composition are found along volcanic island arcs.