Exam 4: Up From the Inferno: Magma and Igneous Rocks

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

As compared to coarse-grained igneous rocks,fine-grained igneous rocks ________.

As compared to mafic igneous rocks,all felsic igneous rocks ________.

Label the cross-section of the convergent boundary shown below.Be sure to use all of the following words/phrases: down-going plate,overriding plate,trench,volcanic arc,volatiles being released,magma forming,Moho,magma rising.

Injecting hot fudge into ice cream and causing the ice cream to melt is an appropriate analogy for which cause of magma melt?

Decompression melting occurs at both ________ and ________.

Most commonly,felsic igneous rocks ________.

A sill is a(n)________.

In general,if a body of igneous (source)rock is subjected to partial melting,the magma that is produced is expected to be ________.

Describe the process of decompression melting;be sure to include an example of where this type of melting occurs within Earth.

Volcanic arcs form along ________ boundaries.

Ash,and larger fragments of pumice are all examples of ________.

Which of the following pictures of volcanoes is the result of a convergent boundary?

The extremely high ________ within Earth keeps the rocks solid.

Coarse-grained granite is most similar in mineral composition to fine-grained ________.