Volcanic Activity
Practice Test
1.
What is the process called when one plate is forced beneath another at a convergent plate boundary?
SC.D.1.4.2
a.
subtraction
b.
convergence
c.
transformation
d.
subduction
2.
What is the shallowest part of the continental margin calle
SC.D.1.4.2
a.
the continental shelf
b.
the shelf break
c.
the continental rise
d.
a submarine canyon
3.
According to the graph, at what depth does the sea floor start to drop off?
SC.D.1.4.2
a.
2 km
b.
8 km
c.
4 km
d.
1 km
4.
How are the convection currents set in motion?
SC.D.1.4.2
a.
spreading mid-ocean ridges
b.
the heat from radioactive decay
c.
slab push
d.
slab push and ridge pull
5.
When magma reaches Earth's surface it is called __________.
SC.D.1.4.2
a.
rock
b.
a batholith
c.
intrusive
d.
lava
6.
Which is not a compositional classification of a magma?
SC.D.1.4.2
a.
basaltic
b.
phaneritic
c.
andesitic
d.
rhyolitic
7.
Harry Hess' theory of __________ explained how ocean crust is generated and destroyed.
SC.D.1.4.2
a.
seafloor spreading
b.
continental movement
c.
continental drift
d.
plate tectonics
8.
An igneous rock with two distinct grain sizes has a __________ texture.
SC.D.1.4.2
a.
fine-grained
b.
felsic
c.
coarse-grained
d.
porphyritic
9.
What is the last mineral to form on the left branch of Bowen's reaction series?
SC.D.1.4.2
a.
olivine
b.
feldspar
c.
quartz
d.
pyroxene
10.
A __________ is a device that can detect changes in the strength of the magnetic field.
SC.D.1.4.2
a.
GPS
b.
satellite
c.
sonar
d.
magnetometer
11.
Why did Wegener think that the Antarctic continent had been closer to the equator in the geologic past?
SC.D.1.4.3
a.
existence of volcanic rocks
b.
existence of coal beds
c.
evidence of fossil fish
d.
existence of the Transantarctic Mountains
12.
What is the name of a large volcanic crater over 1 km in diameter?
SC.D.1.4.2
a.
a batholith
b.
a caldera
c.
a vent
d.
a stock
13.
A __________ is a mushroom-shaped pluton with a round top and flat bottom.
SC.D.1.4.2
a.
sill
b.
batholith
c.
stock
d.
laccolith
14.
What is thought to be the driving mechanism of plate movement?
SC.D.1.4.2
a.
volcanoes
b.
convection currents in the mantle
c.
continental drifting
d.
conduction of heat in the mantle
15.
What type of volcano forms from alternating layers of tephra and nonexplosive lava?
SC.D.1.4.2
a.
shield volcano
b.
caldera
c.
cinder cone
d.
composite volcano
16.
A tabular pluton that cuts across preexisting rock is called a __________.
SC.D.1.4.2
a.
sill
b.
laccolith
c.
stock
d.
dike
17.
Why does magma move up to and through Earth's crust?
SC.D.1.4.2
a.
It is more dense than surrounding rock.
b.
It is less dense than surrounding rock.
c.
It is more viscous than ocean water.
d.
It is cooler than the crust.
18.
What evidence did Wegener use to estimate the time of Pangaea's break up?
SC.D.1.4.3
a.
fossil data
b.
coal deposits
c.
ocean-floor topography
d.
magnetic isochrons
19.
A place where two plates slide laterally past each other is called a __________.
SC.D.1.4.2
a.
convergent boundary
b.
mid-ocean ridge
c.
divergent boundary
d.
transform boundary
