ScienceEarth ScienceQuiz 6 Study Guide
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Quiz 6 Study Guide

Emilia Hughes avatar Emilia Hughes
25 July 2022
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question
What was the most damaging type of eruption that occurred at Vesuvius in Italy?
answer
One or more pyroclastic flows hit the city of Pompeii.
question
What type of basaltic feature is shown in this photograph?
What type of basaltic feature is shown in this photograph?
answer
pahoehoe lava flow
question
Which of the following is NOT true of basaltic lava flows?
answer
They pile up in steep, cone-shaped hills
question
When basaltic lava reaches the ocean they...
answer
form pillow basalts.
question
Shield volcanoes are composed primarily of __________
answer
basalt lava flows.
question
Shield volcanoes have low slopes primarily because
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the low viscosity of basaltic magma allows it to flow downhill for long distances.
question
Volcanic mudflows (lahars) are common on composite volcanoes because
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large amounts of rain and snowmelt mix with loose ash on steep slopes.
question
Which of the numbered features is a pyroclastic flow?
Which of the numbered features is a pyroclastic flow?
answer
4
question
Composite volcanoes are so called because they
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are composed of lava flows, pyroclastic material, and mudflows.
question
The typical form for a composite volcano is a ...
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steep-sided cone.
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The main cause of caldera collapse is...
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collapse of the roof of a magma chamber as magma erupts.
question
Some scientists think that Yellowstone could cause a future disaster because...
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All of these (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
This volcano is broad and low, and is composed of basaltic lava flows. What kind of volcano is it?
This volcano is broad and low, and is composed of basaltic lava flows. What kind of volcano is it?
answer
shield volcanoes
question
Which of the following would be evidence that a volcano has NOT been active for a long period of time?
answer
Well-developed soils on volcanic rocks
question
Comparing these two photographs, which eruption has lower viscosity magma?
answer
the fluid cascade of lava
question
At what depth do gas bubbles have the most effect on magma?
answer
at very shallow levels, such as within the volcano
question
Which of the following are ways that viscosity affects gases in magma?
answer
All of these Viscous magma prevents gas from escaping easily.Abundant silica chains in viscous magma allow gas to pass quickly through the magma.Less viscous magma allows gas to escape, which can lead to very explosive eruptions.
question
Examine this figure and correctly complete this sentence using the proper phrase. Changing conditions from points __ to __ would result in decompression melting.
answer
C to B
question
For the volcanic eruption in this photograph, complete the two missing parts of the sentence using the type of volcanic feature and type of magma
answer
This figure shows a lava flow (type of volcanic feature) that forms from eruption of lowviscosity, mafic lava (type of magma).
question
Which of the magma systems shown is likely to contain mostly basalt?
Which of the magma systems shown is likely to contain mostly basalt?
answer
locations A and B only (Ocean)