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Igneous Processes

Total questions: 50

Worksheet time: 27mins

Name
Class
Date
1.
The volcanoes on the Hawaiian Islands form due to which of the following?
a)
Divergent Boundary
b)
Hot Spot
c)
Subduction Boundary
d)
Transform Boundary
2.
What type of lava cools slowly and forms rock with smooth, ropelike features?
a)
Aa
b)
Magma
c)
Pahoehoe
d)
Pillow Lava
3.
What type of lava cools quickly and forms rock with jagged edges?
a)
Aa
b)
Magma
c)
Pahoehoe
d)
Pillow Lava
4.
Which type of magma has the lowest amount of silica content?
a)
Andesitic Magma
b)
Basaltic Magma
c)
Rhyolitic Magma
d)
Viscous Lava
5.
What is the resistance of a liquid, such as lava, to flow?
a)
Elasticity
b)
Pyroclasticity
c)
Silica
d)
Viscosity
6.

What are solid rock fragments that are ejected during a volcanic eruption?

a)

Lahar

b)

Magma

c)

Tephra

d)

Silica

7.

What type of volcano has steep slopes made of alternating layers of ash and silica rich lava?

a)

Caldera

b)

Cinder Cone

c)

Stratovolcano (aka composite volcano)

d)

Shield Volcano

8.
What type of volcano is made of lava fragments that have been ejected from a volcanic vent?
a)
Caldera
b)
Cinder Cone
c)
Composite Volcano
d)
Shield Volcano
9.
What type of volcano is made of lava fragments that have been ejected from a volcanic vent?
a)
Caldera
b)
Cinder Cone
c)
Composite Volcano
d)
Shield Volcano
10.

What type of volcano is Kilauea, which is located in Hawaii?

a)

Caldera

b)

Cinder Cone

c)

Stratovolcano (aka composite volcano)

d)

Shield Volcano

11.
What kind of magma produces violent volcanic eruptions?
a)
Magma low in silica
b)
Magma that is fluid, and runny
c)
Magma that is high in gas content
d)
Magma rich in iron
12.
What factor(s) determine(s) whether an eruption will be explosive?
a)
The amount of gases in the magma
b)
The amount of silica in the magma
c)
The amount of gas and silica in the magma
d)
None of these affect the explosiveness of the volcano
13.
A high silica volcano makes what type of an explosive?
a)
quiet eruption
b)
explosive eruption
14.
Intrusive Igneous rocks will be 
a)
coarse grain
b)
fine grain
15.
If an Igneous rock is dark-colored, what is the amount of silica?
a)
high
b)
low
c)
doesn't matter
16.
Is Granite high or low in Silica?
a)
high
b)
low
17.
Coarse or Fine?
a)
coarse
b)
fine
18.
How do Intrusive Igneous rocks cool?
a)
quickly
b)
slowly
c)
really fast
19.
What category of igneous rock has two different sizes of crystals?
a)
glassy
b)
extrusive
c)
intrusive
d)
porphyritic
20.
Which of the following textures are found in rocks that are formed intrusively?
a)
Glassy
b)
Vesicular
c)
Phaneritic
21.

Is this rock felsic or mafic?

a)

Felsic

b)

Mafic

22.
The laccolith, batholith an dike are types of __________ ___________.  These are magma that has pushed into existing layers of rock and cooled there.
a)
extrusive sediments
b)
igneous intrusions
c)
metamorphic layers
23.

From which of these does a batholith form?

a)

a small body of magma

b)

a large body of magma

c)

a small body of lava

d)

a large body of lava

24.

Magma that squeezes between horizontal rock layers and hardens is called a ______.

a)

volcanic neck

b)

dike

c)

sill

d)

lava plateau

25.
Igneous intrusions cause which type of metamorphism?
a)
contact
b)
regional
26.
Deadly cloud of gas and ash that comes out of a volcano.
a)
pyroclastic flow
b)
Lahar
c)
mafic
d)
pahoehoe
27.
Smallest volcano type.
a)
Composite
b)
Shield
c)
Cinder Cone
d)
Hot Spot
28.
Which ingredient in magma determines whether an eruption is explosive or quiet?
a)
Amount of rock.
b)
Amount of magma.
c)
Amount of obsidian rock.
d)
Amount of silica.
29.

What provides the force that causes a volcano to become explosive?

a)

Mafic flows

b)

Magma density

c)

Dissolved gases trapped in magma

d)

Extreme heat

30.

What volcanoes are described as having a wide base?

a)

Shield Volcanoes

b)

Cinder Cones

c)

Composite Volcanoes

d)

Calderas

31.

When volcanic ash mixes with water, it forms violent mudflows called ______________

a)

Rolling Ash

b)

Lapilli

c)

Ash Flood

d)

Lahar

32.

Magma that forces itself across rock layers and hardens is called a _________.

a)

volcanic neck

b)

sill

c)

dike

d)

batholith

33.

Which texture best describes an igneous rock that formed slowly, deep underground?

a)

Glassy

b)

Fine Grained

c)

Vesicular

d)

Coarse Grained

34.

Which igneous rock could physically weather to

beach sand that contains the minerals pyroxene,

plagioclase feldspar, and olivine?

a)

rhyolite

b)

granite

c)

peridotite

d)

gabbro

35.

Which two igneous rocks could have the same

mineral composition?

a)

rhyolite and granite

b)

granite and basalt

c)

peridotite and andesite

d)

gabbro and granite

36.

Which processes lead directly to the formation of

igneous rock?

a)

weathering and erosion

b)

compaction and cementation

c)

heat and pressure

d)

melting and crystallization

37.

Which best describes the magma that is found in oceanic crusts?

a)

light and felsic

b)

light and mafic

c)

dark and mafic

d)

dark and felsic

38.

What is the origin of fine-grained igneous rock?

a)

lava that cooled slowly on Earth's surface

b)

lava that cooled quickly on Earth's surface

c)

silt that settled slowly in ocean water

d)

silt that settled quickly in ocean water

39.

Which intrusive igneous rock could be

composed of approximately 60% pyroxene,

25% plagioclase feldspar, 10% olivine, and 5%

hornblende?

a)

granite

b)

rhyolite

c)

gabbro

d)

basalt

40.

In which part of the Earth are felsic rocks most

likely to be found?

a)

continental crust

b)

oceanic crust

c)

mantle

d)

core

41.

Which minerals are present in granite but are

never present in gabbro?

a)

quartz and plagioclase feldspar

b)

potassium feldspar (orthoclase) and quartz

c)

plagioclase feldspar and potassium feldspar

(orthoclase)

d)

biotite mica and hornblende amphibole

42.
These volcanoes form in long cracks where plates are pulled apart.
a)
Shield volcano
b)
Composite / Stratovolcano
c)
Cinder cone
d)
Fissure volcano
43.
Magma's resistance to flow, or how thick it is, is called:
a)
silica
b)
viscosity
c)
hot spot
d)
caldera
44.

Large, basin-shaped depressions that form when summit materials on a volcanic mountain collapse inward after an eruption or loss of magma are known as

a)

cinder cones.

b)

craters.

c)

calderas.

d)

domes.

45.

What process causes the volcanoes of the Hawaiian Islands to form?

a)

subduction zones

b)

divergent boundaries

c)

hot spots

d)

convergent boundaries

46.
The largest intrusive body is a
a)
dike
b)
sill
c)
pluton
d)
batholith
47.
Sheet like intrusions that cut across previous rock units are:
a)
dike
b)
sill
c)
pluton
d)
batholith
48.

Describe the texture of the following igneous rock.

a)

smooth

b)

coarse

c)

vesicular

d)

glassy

49.
a)

fine-grained

b)

coarse-grained

c)

vesicular

d)

glassy

50.
a)

magma - will create extrusive rocks

b)

lava - will create extrusive rocks

c)

magma, will create intrusive rocks

d)

lava, will create intrusive rocks

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