Exam 4: Magma, Igneous Rocks, and Intrusive Activity

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

________ has a large percentage of voids and is lightweight, so therefore has the ability to float in water.

The partial melting of mafic rocks would produce what composition of magma?

Magma can form up to 250 km deep in the Earth.If magma forms at such a depth, how can magma at that depth rise through the mantle and the crust toward the surface?

Magma that forms batholiths forms in the mantle and must migrate upward.However, the sedimentary and metamorphic rocks that surround these batholiths are only moderately deformed.How does a rising magma body make its way through several kilometers of solid rock to be emplaced as a batholith? (Start your journey in the mantle.)

Which of the following minerals is not a ferromagnesian mineral?

All rocks are classified according to ________ and ________.

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

What is a volatile?

How does the presence of silica affect the temperature and viscosity of magma?

Magmas in the magma chamber of a volcano are often compared to soda to explain how the magma is erupted.How is magma like a bottle of soda? What happens to both substances when the pressure changes?

Which of the following substances is not a volatile found in magma?

________ will occur when continental collisions occur, thickening the crust and forcing some rocks to a depth where melting can take place.

When magma forms, it rises up through the crust.Why does magma rise?

Select the choice below that best describes the role of volatiles in an ascending magma.

Of the following substances, which are the common elements in igneous rocks? Silicon, rubidium, nitrogen, carbon, sodium, manganese, hydrogen, oxygen, potassium, calcium, phosphorous, aluminum, iron, chlorine, magnesium, uranium, helium, gold

What would happen to the peridotite if there was a decrease in pressure from that at the depth of 100 km?

Temperatures will decrease with increasing depth into the Earth.

The two branches of Bowen's reaction series are the continuous series and the discontinuous series.In what ways do the minerals in the discontinuous series differ from each other? And the minerals in the continuous series?

Which process is thought to generate most felsic magmas?