Exam 14: Mass Wasting: the Work of Gravity

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

_________is the dominant feldspar in basalt.

Which statement best describes the crystallization of magmas?

Mafic rocks have silica contents of __________and are mainly composed of_________ .

Which of the following best describes an aphanitic texture?

Which of the following is the major dissolved volatile constituent in both magmas and volcanic gases?

As melts cool their viscosity increases (they lose their mobility and get stiffer) even before they start to crystallize because_________ .

What small, intrusive igneous rock bodies often contain gem- quality crystals of minerals such as beryl and tourmaline and high concentrations of relatively rare elements such as lithium, cesium, and uranium?

The molten portion of magmas and lavas is made up of_________ .

What would you name a light pink, aphanitic, fragmental pyroclastic with sparse quartz phenocrysts?

Felsic rocks like granite_______ .

What kind of coarse grained plutonic rock would you expect to find in the ocean crust underneath an undersea basaltic volcano?

Pyroxene, hornblende, and biotite are all minerals found on the ___________series of Bowen's Reaction Series.

Explosive volcanic eruptions occur___________ .

What two rock types are often found interlayered in the same volcanic deposit?

Felsic rocks have silica contents of______ are rich in______ .

The main factors which directly govern the development of texture in all igneous rocks are________

The most common non- ferromagnesian silicate minerals (>40 %) in most igneous rocks are_________

Which texture would be most unlikely to occur in an extrusive igneous rock?

What is the most common extrusive rock type for any volcanic environment on the Earth or even on the Moon?