1)
What is the
difference between island arc and continental magmatic arc?
A)
Island arcs occur in
ocean-continent tectonic settings whereas continental arcs occur in ocean-ocean
tectonic settings.
B)
Island arcs occur in
divergent boundaries where as continental arcs occur in convergent boundaries.
C)
Island arcs and continental
arcs are the same
D)
Island arcs occur in
ocean-ocean tectonic settings whereas continental arcs occur in ocean-continent
tectonic settings.
2)
Which of the
following is NOT and example of ocean-ocean convergence?
A)
Aleutian Islands
B)
Japan Islands
C)
Java-Sumatra/Nicobar Islands
D)
Trans-Mexican Volcanic Chain
E)
Kermadec-Tonga Islands
3)
The San Andreas Transform is a plate boundary
between which two tectonic plates?
A)
Pacific plate, Juan de Fuca
plate
B)
Farallon plate, North
American plate
C)
Nazca plate, Pacific plate
D)
Pacific plate, North
American plate
4)
What are the
three types of plate tectonic boundaries?
A)
ocean-ocean, ocean-cont.,
cont.-cont.
B)
asthenosphere, lithosphere,
mantle
C)
transform, divergent,
convergent
D)
crust, mantle, core
5)
What causes the mantle to
melt at subduction zones (~150 km depth) to form arc volcanoes?
A)
higher temperature
B)
dewatering of ocean
lithosphere
C)
mantle plumes
6)
Igneous rocks are classified
based principally on what two characteristics?
a.
volcanic, plutonic
b.
phaneritic,
aphanitic
c.
texture, composition
7)
Volcanic rocks are typically
______ and plutonic rocks are typically ______.
A)
coarse grained, fine grained
B)
fine grained, coarse grained
C)
black, light
D)
mafic, felsic
8) What is the general
definition of tuff?
A)
volcanic rock composed
mostly of lapilli
B)
volcanic rock composed
mostly of ash
C)
volcanic rock composed
mostly of breccia
D)
D) volcanic rock composed mostly of blocks
9) Which of the following best describes tephra?
i.
Lower flow-banded Rhyolite
at Pinnacles
ii.
Perlite in Lower Rhyolite
unit
iii.
Pink, Rhyolite Breccia unit
iv.
Green Lapillit Tuff unit
10) Stratovolcanoes have _____ lava and ______
eruptions.
A)
andesite, explosive
B)
mafic, non-explosive
C)
felsic, explosive
D)
basaltic, explosive
11) What is the approximate age of the Pinnacles and
Neenach volcanic fields, what is their geographic relationship, and what
evidence do they provide concerning movement along the San Andreas fault?
12) Why is the distinction between the San Andreas
Transform and San Andreas Fault important?
13) Which unit found at the Pinnacles and at the Neenach
volcanic fields is characterized by glassy, perlite at top of the lava flow?
14) Which volcanic unit exposed at the Pinnacles is not exposed at the
Neenach volcanic field?
15) How are the “caves” found at
Pinnacles formed?
16) If the rate of movement on
the San Andreas Fault System is 2 cm/yr, how long in millions of years will it
take for the Pinnacles to reach the Bay Area that is 100 miles to the north?
17) What is a triple junction?
18) What has been the geologic
history of the Mendocino Triple Junction since its birth 28 million years ago?
19) What is a slab window and
how does this contribute to magmatism?
20) Subduction zone magmatism
occurs near the trench (like the Pinnalces and other volcanics in the Coast Ranges).
TRUE or FALSE
21) What is the age of eastern
Coast Range Volcanics as you move from south to north (what is the age
progression)?