Which of the following are ways that viscosity affects gases in magma?
answer
Viscous magma prevents gas from escaping easily.
question
Some scientists think that Yellowstone could cause a future disaster because:
answer
the area is part of a caldera
scientists think that magma is still present at depth
past eruptions from Yellowstone carried ash over a huge area of western North America
land near Yellowstone is uplifting in some places and subsiding in others
question
Composite volcanoes are so called because they:
answer
are composed of lava flows, pyroclastic material, and mudflows
question
A _____ is a mixture of gas and pyroclastic debris that is so dense that it hugs the ground as it flows rapidly into low areas.
answer
pyroclastic flow
question
The most dangerous type of volcano listed below is a:
answer
composite volcano
question
Which of the following volcanoes is generally the largest?
answer
shield volcano
question
Which of the following igneous rocks would be formed by the fastest cooling?
answer
volcanic glass
question
igneous rocks that are silica-deficient but high in iron and magnesium
answer
mafic
question
Which of the following minerals would likely crystallize late from magma?
answer
quartz
question
Which of the following acts to keep a rock solid (instead of melting)?
answer
an increase in confining pressure
question
Differentiation:
answer
produces two different compositions of rock from one rock.
question
produces two different compositions of rock from one rock.
answer
there was water in the magma
question
Rows in the Periodic Table correspond to:
answer
the number of electron shells
question
The term aphanitic texture describes a rock where:
answer
crystals are too small to see with the naked eye.
question
A vesicular igneous texture indicates that:
answer
there was a lot of gas in the magma
question
Fine-grained igneous rocks (grains < 1.0 mm) that have small grains cooled rapidly and are likely to be _______.
answer
extrusive
question
A finely crystalline or glassy igneous texture indicates that:
answer
the rock cooled quickly
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