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Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN: 9780134746241
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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Question
For Site B, use the rock samples to predict whether the magma for that site has a high or low viscosity and whether the volcano would erupt explosively or effusively.
A) High Viscosity & Effusive
B) Low Viscosity & Effusive
C) High Viscosity & Explosive
D) Low Viscosity & Explosive
![Site D: A continental magmatic arc,
where volcanoes are on top of a
mountain belt nearthe edge ofthe
continent. The volcanoes erupt light-
colored and gray volcanic rocks.
Older intrusive rocks, some with
coarse crystals, are also exposed.
[Samples 5,6, and 7]
Site A: A line of volcanic
islands and submarine
mountains. Broadvolcanoes on
the islands are foming dark
volcanic rocks. [Sample 1].
Site E: An island arc,
Site B: Circular
volcanic depressions
(calderas) on land,
which are filled with
light-colored volcanic
ash and light-colored
volcanic rocks.
which is a chain of
volcanic islands
adjacent to an ocearic
trench. The volcanoes
erupt gray volcanic
ash andlava flows.
There are also some
[Samples 2 and 3]
intrusive rocks.
[Samples 8 and 9]
Site C: A mid-oceanridge that zigzags across the ocean floor. The rock sample
is dark colored andis from a lumpy lava flow on the seafloor. [Sample 4]](https://content.bartleby.com/qna-images/question/7ca874b9-cbf0-443e-b65b-4d9e35817072/266af872-f3bb-437c-a5a2-4047e303a819/qn4t7d_thumbnail.png)
Transcribed Image Text:Site D: A continental magmatic arc,
where volcanoes are on top of a
mountain belt nearthe edge ofthe
continent. The volcanoes erupt light-
colored and gray volcanic rocks.
Older intrusive rocks, some with
coarse crystals, are also exposed.
[Samples 5,6, and 7]
Site A: A line of volcanic
islands and submarine
mountains. Broadvolcanoes on
the islands are foming dark
volcanic rocks. [Sample 1].
Site E: An island arc,
Site B: Circular
volcanic depressions
(calderas) on land,
which are filled with
light-colored volcanic
ash and light-colored
volcanic rocks.
which is a chain of
volcanic islands
adjacent to an ocearic
trench. The volcanoes
erupt gray volcanic
ash andlava flows.
There are also some
[Samples 2 and 3]
intrusive rocks.
[Samples 8 and 9]
Site C: A mid-oceanridge that zigzags across the ocean floor. The rock sample
is dark colored andis from a lumpy lava flow on the seafloor. [Sample 4]

Transcribed Image Text:Rock 3. This brown-colored rock
Rock 1. This rock is
dark colored, has no
visible crystals, and
is not glassy. It does
have many vesicles
(holes) and is a vol-
canic rock. A chemi-
Rock 2. This light-colored rock is finely crys-
talline and not glassy. It contains some fine-
grained gray crystals and a few small holes.
A chemical analysis documents that it is a
felsic rock. It was collected on a volcano.
contains large, light-colored lenses of
flattened pumice in a finely crystalline
matrix. Under the microscope, the
matrix contains compacted volcanic
ash, along with
small crystals and
fragments of other
rocks. The crystals
are mostly quartz
and K-feldspar.
cal analysis revealed
a relatively low silica
content.
Rock 4. This rock
is finely crystalline
and lacks visible
crystals. It has a
dark-gray color. A
chemical analysis
of the sample
indicates that it
is a mafic rock.
Rock 6. This rock
2
has very large crys-
tals, some of which
are 5 to 10 cm long.
Most of the rock
is K-feldspar and
quartz, and the dark
crystals are a type
of amphibole that
is most common in
felsic rocks.
4
Rock 5. This porous
rock in the center
of the photograph
has numerous holes
and is extremely
lightweight. It is
light colored and is
composed of vol-
canic glass. There
are no visible crys-
tals, but the rock is
likely to be felsic in
composition.
Rock 9. This rock
contains large crys-
tals of K-feldspar
in a brown-colored
matrix of small
to medium-sized
7.
8.
crystals. There is
no glass, ash, or
Rock 7. This medium-grained rock is a plutonic rock. It has a
Rock 8. This rock has scattered visible crystals of
salt-and-pepper appearance, caused by the presence of felsic amphibole and biotite in a medium-gray, finely crystal- vesicles, so the rock
minerals (feldspar and quartz) and mafic minerals (mostly bio-
tite mica). It is intermediate in composition.
line matrix. It reportedly was collected either on a vol- is probably not a
cano or from dikes exposed near a volcano.
volcanic rock.
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