1) What type of rock
is shown on the screen?
a)
Igneous intrusive
b)
Igneous extrusive
c)
Metamorphic
d)
Sedimentary
2) What type of rock
is shown on the screen?
a)
Igneous intrusive
b)
Igneous extrusive
c)
Metamorphic
d)
Sedimentary
3) Which one of these
statements about lava and magma is true?
a)
Lava is liquid rock at the earthís surface; magma is the fine-grained part
of the rock.
b)
Lava is liquid rock at the earthís surface; magma is liquid rock beneath
the earthís surface.
c)
Lava is liquid rock at the earthís surface; magma is violently ejected
material from a volcano.
d)
Lava is liquid rock at earthís surface; magma is any type of crystalline
rock, incl metamorphic.
e)
Lava is liquid rock at the earthís surface; magma is intrusive rock that
has been exposed byerosion.
4) The presence of
phenocrysts in volcanic rocks indicates
a)
Partial melting at the transition of metamorphic to igneous processes.
b)
Partial crystallization after cooling of the rock.
c)
Partial crystallization before eruption.
d)
Addition of extra silica to the magma.
e)
Phenocrysts donít exist in volcanic rocks.
5) Which of the following
igneous rocks is compositionally similar to granite?
a)
basalt
b)
peridotite
c)
gabbro
d)
andesite
e)
rhyolite
6) The two most abundant
elements in the earthís crust are
a)
iron and magnesium
b)
iron and oxygen
c)
iron and silicon
d)
oxygen and silicon
e)
quartz and feldspar
7) The two most abundant
elements in the whole earth are
a)
iron and magnesium
b)
iron and oxygen
c)
iron and silicon
d)
oxygen and silicon
e)
olivine and pyroxene
8) The Moho is
a)
the boundary between the crust and the mantle
b)
the boundary between the oceanic and continental crust
c)
the boundary between the lithosphere and the asthenosphere
d)
the boundary between the core and the mantle
e)
none of the above.
9) Evidence that the
asthenosphere is partially melted comes from seismic waves.Which
of the following statements is true?
a)
Velocity of P waves increases when entering the asthenosphere while S waves
decrease.
b)
Velocity of P waves and S waves both decrease when entering the asthenosphere.
c)
Velocity of P waves and S waves both increase when entering the asthenosphere.
d)
Velocity of P waves decreases when entering the asthenosphere while S waves
increase.
e)
P waves stop.
10) The lithosphere
a)
consists of the lower mantle and transitional zone.
b)
corresponds to the continental crust.
c)
corresponds to the oceanic crust.
d)
consists of the continental and oceanic crust.
e)
consists of the crust and upper mantle.
11) The mineral Potassium
feldspar is an important common component of granite.It
has the chemical formula KalSi308.In
which class does it belong?
a)
silicates
b)
carbonates
c)
sulfates
d)
sulfides
e)
oxides
12) Igneous rocks form
at which of these plate tectonic settings?
a)
convergent collisional
b)
convergent subduction zones
c)
divergent
d)
b and c
e)
all of the above
13) An ultramafic igneous
rock isÖ
a)
one in which silica content is less than about 50%
b)
one in which silica content is more than about 50%
c)
an intrusive mafic rock
d)
an extrusive mafic rock
e)
a volcanic rock that is expelled violently during an eruption.
14) Viscosity plays
an important role in volcanic activity because
a)
higher viscosity magmas tend to be less explosive.
b)
higher viscosity magmas tend to produce steeper volcanoes.
c)
higher viscosity magmas tend to produce rocks of greater density.
d)
b and c
e)
a, b, and c
15) Volcanoes form
above subduction zones because
a)
the descending oceanic plate melts to produce magma.
b)
the descending continental plate melts to produce magma.
c)
the inward plate motion thrusts rocks skyward.
d)
the descending plate heats and releases water, which causes melting in
the overriding plate.
e)
the descending plate heats up, which in turns heats the overriding plate
to cause melting.