Exam 6: Volcanoes and Igneous Rocks

The composition of most magma is 40%-75% ________ by weight.

In the figure below,which of the igneous intrusive bodies is parallel to pre-existing bedding?

The person in the figure below was encased by a pyroclastic flow.

A _______ is a mixture of molten and solid rock.

In the figure below,please discuss the correlation between atmospheric temperature and acidity of the volcanic eruption.

_______ igneous rocks are composed of dark-colored minerals rich in magnesium and iron.

Normally,Earth's geothermal gradient increases approximately 10.2ºC per kilometer of depth.

Discuss the relationships between gabbro and basalt and granite and rhyolite.

In the figure below,_______ is the process that occurs when newly formed crystals are lighter than magma and float to the top of the magma chamber

The magma from erupting volcanoes has a temperature ranging between ________.

Small pyroclasts welded together during an eruption results in the formation of a tuff.

Contrast igneous rock textures between those formed internally (intrusively)and those formed externally (extrusively).

In the figure below,beaker #2 is the closest to having a 25% melt.

In the figure below,rocks at a temperature of _______ have pressures of approximately 5000mpa.

The presence of higher amounts of water usually results in the lowering of the melting temperature.

_______ magma contains more dissolved gases and tends to be more explosive.

When groundwater comes in contact with hot rock,it heats up and creates a resurgent dome.

The degree to which a substance resists flow is known as _______.

Igneous rocks with small crystals undergo _______ cooling.

Vulcanian eruptions are not very explosive and only release ash 5km into the air.