Exam 14: Mass Wasting: the Work of Gravity

What is the rock colour (total % of dark minerals) of a typical granite or rhyolite?

__________typically exhibit pyroclastic textures.

Which of the following has the same mineral composition as andesite?

What would you name a black, phaneritic rock with 25% Ca- plagioclase and the remainder composed of olivine, pyroxene, and amphibole?

Which igneous texture indicates two, distinctly different sizes of mineral grains?

Light coloured aphanitic rocks________ .

Yellowstone National Park is most famous for what?

A __________ is an intrusive, igneous rock body that is tabular and concordant.

While the ultramafic rock, peridotite, comprises the bulk of the mantle, the earth hasn't been hot enough to make much_________(its volcanic equivalent) since the Precambrian.

The behaviour and processes that govern the textures of magmatic rocks depend on the content of a magma's three distinct parts:___________ .

Which of the following igneous rock always has a pyroclastic texture?

In what texture are mineral grains of roughly equal size and coarse enough to be seen without a microscope or magnifying glass?

What would you name an intermediate coloured, coarse fragmental volcanic rock with large amphibole and plagioclase phenocrysts?

How long does it take for a large magma body at great depth to cool and completely crystallize?

Magmas rise to shallower depths and intrude the crust or extrude on the surface because__________ .

A __________ is a near surface, intrusive, igneous rock body that results from local inflation of a horizontal sill.

Which of the following best describes the composition and form of the typical felsic bedrock in the Coast Ranges of BC, highlands of Nova Scotia, or the Sierra Nevada Mountains in California?

Visible quartz and potassium feldspar grains are the main constituents in which igneous rock?

Intermediate rocks like andesite and diorite _________.

The earliest formed crystals (phenocrysts) in a magma tend to be _________.