geoscience volcano test review

 

Calderas form from ___

when a magma chamber empties during a large volcanic eruption, causing the ground above to collapse

 

What is not a significant volcanic hazard?

A. being overrun by a fast moving basaltic lava flow

 

A ________ is the largest body of intrusive, igneous rock.

batholith

________ magma is the most abundant type of magma erupted on Earth. It has low viscosity, is runny, and makes up the rock on the ocean floor.

basaltic 

Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiet?

compostion of magma, amount dissolved gas in the magma,

conduits and vents form ___

under craters

Pyroclastic flows move ________

very rapidly, too fast to outrun on foot, as a dense cloud that contains hot magma particles suspended in hot gases and moves rapidly downhill

The slopes of most cinder cones are usually steep because ________.

the loose materials ejected from the cone form steep slopes

true or false; Powerful, explosive, volcanic eruptions can result in climatic cooling for millions of years following the eruption.

false

A ________ is an intrusive, igneous rock body that is tabular (flattened) and concordant (parallel to rock layers).

a sill

Basaltic magma is ___ and has a ___ viscosity

felsic, low

Which type of plate margin (boundary) is characterized by volcanoes that include basalt, andesite, and rhyolite?

covergent plate boundary