Florida Gateway College
Earth Science/Dr. Kane
Chapter 7
(Igneous Activity/Volcanoes)
1. Open this link: Earth Revealed series and watch the Video #13 (Volcanism)
2. Go to the Key terms page below, print out the page and answer the questions
3. Print out the test page below and answer the questions
4. Bring the package with you on test day to get credit. Homework counts for
25% of your final grade.
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HOMEWORK/K
EY TERMS
KEY TERMS
Chapter 3 and 9: (Metamorphic/Sedimentary rocks and volcanic activity)
Research these words in chapter 9 and as well and the key words from the video - test 2 (chapter 2) to
prepare you for test3. Most questions will be centered, but not limited, to theses terms.
I - Magma and Lava (Definition)
Volcanic ash (Definition)
Basaltic lava, felsic lava, intermediate lava (Definition)
Match the type of lava (felsic/andesitic, mafic) with the type of viscosity (high or low viscosity)
Pyroclastic flow (Definition, type of volcano that produces it)
II - Volcanic activity relation to plate boundaries:
Divergent plate boundaries (Type of volcano and volcanic activity)
Convergent plate boundaries (Type of volcano and volcanic activity)
Hawaiian volcanoes chain (origin, location w/ regard to plate boundary, type of lava)
Shield volcanoes (Definition, location w/ regard to plate boundary)
Cinder cone volcanoes (Definition, location w/ regard to plate boundary)
Hot-Spots (Definition, location w/ regard to plate boundary)
Most explosive volcanoes relation to plate boundaries
Composite volcanoes (Definition, location w/ regard to plate boundary, type of lava)
Temperature and chemical composition relation to volcanic eruption
Correlate silica content (SiO2) with viscosity of a magma/lava
Correlate magma/lava viscosity with volcanic explosiveness.
Role of gases in volcanic eruption
Common gases in magma
Pumice (Definition)
Pahoehoe (Pah-hoy-hoy) (Definition, type of lava)
AA (ah-ah) (Definition, type of lava)
Obsidian (Definition, type of lava)
Caldera (Definition)
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Essay Questions/
Chapters 7
1.
Define viscosity of a magma
2.
Explain how temperature and volatiles content affect magma viscosity
3.
Why are composite cone volcanoes so explosive and so steep? Explain
4.
Why do Hawaiian volcanoes form a chain?
5.
Why are shield volcanoes so flat, broad and gently sloping?
6.
Explain why Hawaiian volcanoes emit basaltic lava while the Pacific North West volcanoes
produce andesitic lava.
7.
What type of lava would you expect a continental volcanic arc volcano to emit? Why?
8.
Name composite cone deadly arsenal
HOMEWORK/PRAC
TICE TEST
Circle the correct answer
1.
The definition of magma could be
a.
b.
c.
d.
e.
2.
Hard rock
Molten rock in a magma chamber
Acid rock
All of the above
None of the above
The definition of lava could be
a.
b.
c
River of molten rock on a volcanic slope
Hard rock like the Stone Mt Granite rock
All of the above
d.
3.
A pyroclastic material is a mixture of _____________.
a.
b.
c.
d.
4.
Fluid flows of basaltic lava
Fluid flows of felsic lava
Large thick and viscous pyroclastic flows
Thick flows of andesitic to felsic lava
Volcanoes of the Cascade Range are at
a.
b.
c.
d.
e.
9.
Mt. St. Helens, WA
Kilauea, Hawaii
Vesuvius, Italy
Mt. Fuji, Japan
Mt. Rainier, WA
Shield volcanoes are produced by the accumulation of
a.
b.
c.
d.
8.
Felsic to andesitic lava and pyroclastic material
Basaltic lava
All of these
None of these
One of these volcanoes is formed over a hot spot
a.
b.
c.
d.
e.
7.
Steep cones
Broad gently sloping cones
Caldera like structures only
None of these
Volcanoes at divergent plate boundary erupt mainly ___________.
a.
b.
c.
d
6.
Ash and dust particles (fragments)
Ash only
Dust particles only
None of these
Volcanoes that erupt felsic/andesitic lava build _____________.
a.
b.
c.
d.
5.
None of the above
Divergent boundary
Convergent boundary
Hot spots
All of these
None of the above
Continental volcanic arcs are found at
a.
Convergent plate boundaries
b.
c.
d.
10.
Volcanoes at convergent plate boundaries are more explosive than those on hot-spots
because
a.
b.
c.
d.
11.
13.
a.
True _____________
b.
False ____________
The most common gases in volcanic eruptions are
Water, carbon dioxide, nitrogen
Water, sulfur, methane
Carbon dioxide, methane, nitrogen
Water, oxygen, hydrogen
None of the above
Hawaiian volcanoes are an example of ________________.volcanoes
a.
b.
c.
d.
e.
15.
eruption
Cinder cone
Composite cone
Shield
No relation
All volcanoes erupt gases
a.
b.
c.
d.
e.
14.
Their felsic to andesitic lava traps more gases that expand near the surface
Their basaltic lava trap more gases that expand near the surface
All of the above
No relation whatsoever
Most Volcanoes at convergent plate boundaries are ___________ volcanoes.
a.
b.
c.
d.
12.
Divergent plate boundaries
Transform fault
None of the above
Shield
Cinder cone
Composite cone
All of the above
None of the above
Temperature and chemical composition do not influence the explosiveness of an
a.
True _____________
b.
False ____________
16.
Explosive eruptions are produced by volcanoes which are______________.
a.
b.
c.
d.
17.
18.
A pumice is formed from a viscous and highly gaseous magma
20.
21.
23.
True ___________
b.
False ___________
Viscosity
Iron content
Magnesium content
Amount of gases present
a and d
A Pahoehoe (pah-hoy-hoy) is Hawaiian for a type of gases-free lava with jagged surface
a.
True _____________
b.
False ____________
An AA (ah-ah) is Hawaiian for a wrinkled and ropy lava with dissolved gases
a.
True ____________
b.
False ____________
A cinder cone is a type of volcano made entirely of
a.
b.
c.
d.
22.
a.
The explosiveness of an eruption is influenced by the ____________ of its lava.
a.
b.
c.
d.
e.
19.
Felsic/andesitic, cooler, and trap more gases
Basaltic, hotter, trap less gases
Felsic to basaltic, cooler, trap less gases
What the difference anyway, all volcanoes are explosive to me
Basaltic rock
Felsic rock
Fragments
None of the above
Shield volcanoes are a type of volcanoes that are broad and gently sloping
a.
True ___________
b.
False ___________
Most volcanoes occur in these plate boundaries and settings
a.
b.
c.
d.
e.
24.
In a chain a volcanoes is formed above a hot spot when
a.
b.
c.
25.
26.
a.
True ___________
b.
False __________
The last largest eruption of Mount St. Helens, in Washington State was,
29.
30.
May 18, 1988
May 18, 1980
June 18, 1980
I did not watch that video or I don’t remember
The energy collected from volcanic activity is called
a.
b.
c.
d.
e.
28.
Many of the volcanoes can be active at the same time
Only one is active at a time
None of these
A Caldera is a vast volcanic crater that has collapsed
a.
b.
c.
d.
27.
Intraplate (Hot-spots)
Convergent boundary
Divergent boundary
All of the above
a and b only
Geophysical energy
Geothermal energy
Geovolcanic energy
Geologic energy
None of the above
A volcanic dome is a crater dome formed of obsidian
a.
True ___________
b.
False __________
Explosive volcanoes build steep cones because their lava is fluid
a.
True _____________
b.
False ____________
Composite cone volcanoes emit both lava and pyroclastic (ash and fragments) flows
a.
True ______________
b.
31.
The protolith of marble in contact metamorphism is
a.
b.
c.
d.
32.
Weathering and erosion
Weathering, erosion, and compaction
Cementation and compaction
Erosion, cementation, and compaction
Sandstone is a_____________ sedimentary rock
a.
b.
c.
d.
38.
Temperature (Heat)
Pressure
a and b
Lithification means ________________ of loose sediment into a sedimentary rock
a.
b.
c.
d.
37.
Temperature (Heat) mainly
Pressure mainly
Both temperature and pressure equally
Regional metamorphism involves only
a.
b.
c.
36.
Regional metamorphism
Contact metamorphism
Contact metamorphism involves only
a.
b.
c.
35.
Regional metamorphism
Contact metamorphism
Widespread metamorphism created along convergent plate boundary is called
a.
b.
34.
Granite
Limestone
Slate
Gneiss
Metamorphism created when a cold rock is intruded by a hot magma body is called
a.
b.
33.
False _____________
Chemical inorganic
Detrital
Chemical organic (biochemical)
All of the above
Limestone is a _________________sedimentary rock
a.
b.
c.
d.
Chemical inorganic
Detrital
Chemical organic (biochemical)
All of the above
39.
Marble is a chemical inorganic sedimentary rock
a.
b.
40.
True
False
Gypsum is a_____________ sedimentary rock
a.
b.
c.
d.
e.
Chemical inorganic
Evaporite
a and b
Detrital
Chemical organic (biochemical)
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Extra Credit Questions: (20%) Write answer on the back of scantron.
1.
The texture of an igneous rock is determined by these factors
a.
b.
c.
d.
e.
2.
Name a slowly cooling, felsic intrusive, igneous rock:
a.
b.
c.
d.
3.
Gabbro
Basalt
Granite
Rhyolite
Name a fast cooling, mafic extrusive, igneous rock filled with voids:
a.
b.
c.
d.
e.
4.
Cooling rate of the magma
Amount of silica in the magma
Amount of volatile present in the magma
Amount of iron and magnesium in the magma
a, b, and c
Rhyolite
Porphyritic basalt
Vesicular basalt
Obsidian
Pumice
Three factors play an important role in magma generation
a.
Heat increase, increase in water vapor, and oxygen
b.
Heat increase, drop in confining pressure, and increase in volatiles
c.
Water vapor, increase in amount of silica content, and volatiles
d.
Heat, heat, nothing but heat,… it’s getting hot in here
e
There are no three important factors, they work independently
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