Exam 6: Up From the Inferno: Magma and Igneous Rocks

An igneous rock with a mixed texture of coarse crystals (phenocrysts)surrounded by fine crystals (groundmass)is termed ________.

Pillow basalts attain their distinctive blob-like shapes because their parent lavas do not travel far prior to solidification.This is because the parent lavas ________.

If the volatile content of magma is increased,its viscosity will ________.

Very early in Earth's history (during the Hadean Eon),the Earth ________.

Bowen's continuous reaction series describes the crystallization behavior of which single mineral (with variable chemical composition)?

The difference between magma and lava is ________.

Stoping by magmas occurs when ________.

In general,when rock is partially melted,the chemistry of the melt is ________.

As compared to aphanitic igneous rocks,phaneritic rocks are ________.

In Bowen's discontinuous reaction series,the first mineral to crystallize from a mafic melt is ________.

Which type of magma has the greatest silica content?

Ash and lava fragments that cascade down the sides of a volcano eventually settle and lithify to form an extrusive igneous rock called ________.

A body of rock begins at location A in the figure below.The rock,over a period of time,moves to location B and begins to melt.This is an example of melting due to ________.

Mt.Kilimanjaro is an active volcano in Tanzania in eastern Africa that has formed as a result of ________.

All other factors being equal (i.e.,depth,volume,temperature,etc.),which type of igneous intrusion would cool fastest?

The geotherm is the rate of change of ________.

The presence of vesicles in an igneous rock is evidence that the source melt ________.

An irregular-shaped and blob-like igneous rock body that cooled beneath the surface of Earth is ________.

All other factors being equal,intrusive rocks that form deep within Earth ________ than intrusive rocks that cool near the surface.

Volatiles refer to substances that ________.