Laboratory Manual for Introductory Geology

Bradley Deline, Randa Harris, Karen Tefend

Chapter 8

Igneous Rocks - all with Video Answers

Educators

Chapter Questions

Problem 1

Sample I1 has what mafic color index (MCI)?
a. $0-15 \% \mathrm{MCI}$
b. $16-45 \%$ MCI
c. $46-85 \% \mathrm{MCI}$
d. $>85 \%$ MCI

Zulfiqar Ali

Zulfiqar Ali

Numerade Educator

Problem 2

Sample I1 has pink colored minerals present, which are most likely _________.
a. quartz b. biotite c. orthoclase d. Ca-rich plagioclase

Prem Bijarniya

Numerade Educator

Problem 3

The small, dark colored minerals in Sample I1 are most likely _________.
a. quartz b. biotite c. orthoclase d. Na-rich plagioclase

Prem Bijarniya

Numerade Educator

Problem 4

Sample I1 belongs to which igneous rock classification?
a. ultramafic
b. mafic
c. intermediate
d. felsic

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 5

Sample I2 has what mafic color index (MCI)?
a. $0-15 \%$ MCI
b. $16-45 \% \mathrm{MCI}$
c. $46-85 \% \mathrm{MCI}$
d. $>85 \%$ MCI

Narayan Hari

Numerade Educator

Problem 6

Sample I2 belongs to which igneous rock classification?
a. ultramafic
b. mafic
c. intermediate
d. felsic

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 7

Sample I 3 has what mafic color index (MCI)?
a. $0-15 \% \mathrm{MCI}$
b. $16-45 \% \mathrm{MCI}$
c. $46-85 \%$ MCI
d. $>85 \%$ MCI

Shazia Naz

Numerade Educator

Problem 8

Sample Is belongs to which igneous rock classification?
a. ultramafic
b. mafic
c. intermediate
d. felsic

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 9

Sample I 4 has what mafic color index (MCI)?
a. $0-15 \% \mathrm{MCI}$
b. $16-45 \% \mathrm{MCI}$
c. 46-85\% MCI
d. $>85 \%$ MCI

Zulfiqar Ali

Numerade Educator

Problem 10

Sample I 5 has what mafic color index (MCI)?
a. $0-15 \% \mathrm{MCI}$
b. $16-45 \% \mathrm{MCI}$
c. $46-85 \%$ MCI
d. $>85 \%$ MCI

Declan Nell

Numerade Educator

Problem 11

Sample Is has what mafic color index (MCI)?
a. $0-15 \% \mathrm{MCI}$
b. $16-45 \%$ MCI
c. $46-85 \%$ MCI
d. $>85 \%$ MCI

Zulfiqar Ali

Numerade Educator

Problem 12

The white minerals in Sample I 5 are most likely _______.
a. quartz
b. biotite
c. orthoclase
d. plagioclase

Prem Bijarniya

Numerade Educator

Problem 13

Sample I 7 has what mafic color index (MCI)?
a. $0-15 \% \mathrm{MCI}$
b. $16-45 \%$ MCI
c. $46-85 \% \mathrm{MCI}$
d. $>85 \%$ MCI

Shazia Naz

Numerade Educator

Problem 14

According to Figure 8.1, Sample I4 will never contain which mineral?
a. olivine
b. pyroxene
c. amphibole
d. quartz

Prem Bijarniya

Numerade Educator

Problem 15

According to Figure 8.1, Sample I 7 must contain which mineral?
a. olivine
b. pyroxene
c. amphibole
d. quartz

Prem Bijarniya

Numerade Educator

Problem 16

According to Bowen's Reaction Series, Sample Is (if heated) should start melting at what temperature?
a. $\sim 1100^{\circ} \mathrm{C}$
b. $\sim 900^{\circ} \mathrm{C}$
c. $\sim 800^{\circ} \mathrm{C}$
d. $\sim 500^{\circ} \mathrm{C}$

David Collins

Numerade Educator

Problem 17

According to Figure $8.1$, when Sample I1 is heated, what is the first mineral to melt?
a. olivine
b. Ca-rich plagioclase
c. potassium feldspar
d. quartz

Prem Bijarniya

Numerade Educator

Problem 18

Sample I1 has what texture?
a. phaneritic
b. aphanitic
c. porphyritic-aphanitic
d. glassy

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 19

How did Sample I 1 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

William Dunkerton

William Dunkerton

Numerade Educator

Problem 20

Sample I1 is called______________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 21

Sample I1 can also be called ___________.
a. volcanic b. plutonic

Nicholas L'Heureux

Nicholas L'Heureux

Numerade Educator

Problem 22

Sample I2 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Ramesh Singh

Numerade Educator

Problem 23

How did Sample I2 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

Averell Hause

Carnegie Mellon University

Problem 24

Sample I2 is called______________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 25

Sample I2 can also be called ____________.
a. volcanic b. plutonic

Nicholas L'Heureux

Nicholas L'Heureux

Numerade Educator

Problem 26

Sample I3 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Vysakh M

Numerade Educator

Problem 27

How did Sample I3 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

Averell Hause

Carnegie Mellon University

Problem 28

Sample I3 is called______________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 29

Sample I3 can also be called __________.
a. volcanic b. plutonic

Narayan Hari

Numerade Educator

Problem 30

Sample I4 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 31

How did Sample I4 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

William Dunkerton

William Dunkerton

Numerade Educator

Problem 32

Sample I4 is called______________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 33

Sample I4 can also be called ____________.
a. volcanic b. plutonic

Nicholas L'Heureux

Nicholas L'Heureux

Numerade Educator

Problem 34

Sample I5 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Prem Bijarniya

Numerade Educator

Problem 35

How did Sample I5 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

Zachary Warner

Numerade Educator

Problem 36

Sample I5 is called______________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 37

Sample I5 can also be called _____________.
a. volcanic b. plutonic

Narayan Hari

Numerade Educator

Problem 38

Sample I6 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 39

Sample I6 has what composition?
a. felsic b. intermediate c. mafic d. any of the above

Zachary Papazian

Zachary Papazian

Numerade Educator

Problem 40

How did Sample I6 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

Check back soon!

Problem 41

Sample I6 is called_________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 42

Sample I7 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Joanna Quigley

Numerade Educator

Problem 43

How did Sample I7 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

Zachary Warner

Numerade Educator

Problem 44

Sample I7 is called______________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 45

Sample I7 can also be called ___________.
a. volcanic b. plutonic

Anatole Borisov

Anatole Borisov

Numerade Educator

Problem 46

Sample I8 has what texture?
a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 47

Sample I8 has what composition?
a. felsic b. intermediate c. mafic d. any of the above

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 48

How did Sample I8 form?
a. by magma that cooled slowly
b. by fast cooling lava
c. by a very fast cooling of a lava
d. by a very fast cooling magma during a volcanic eruption
e. by magma that was cooling slowly, then as a lava that cooled quickly

Ajay Singhal

Numerade Educator

Problem 49

Sample I8 is called_________.
a. obsidian b. pumice c. granite d. rhyolite
e. diorite f. andesite g. gabbro h. basalt

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 50

Type the following coordinates into the search bar in Google Earth: 33 48 14.24
N 84 08 44.31 W. This is Stone Mountain, GA. Zoom in to an eye elevation of
~2400 ft for a closer look. Based on the color, and assuming no color change has
occurred due to weathering at this location, what is the composition of rock?
a. ultramafic b. mafic c. intermediate d. felsic

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 51

Zoom out to an eye elevation of $\sim 1500 \mathrm{ft}$ so that you can seethe entire mountain. Click on the ruler icon to open up the ruler function. Select the Line tab, and change the map length to kilometers. What is the longest length of exposed portion of Stone Mountain?
a. $3000 \mathrm{~km}$
b. $260 \mathrm{~km}$
c. $6 \mathrm{~km}$
d. $2.6 \mathrm{~km}$

Prabhu Ramji

Numerade Educator

Problem 52

Based on your measurement of the longest dimension, Stone Mountain can be classified as:
a. a batholith
b. a stock

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 53

Type the following coordinates into the search bar in Google Earth: $645845.54$ N $164307.04$ W. Zoom in to an eye elevation of $\sim 12979$ ft for a closer look. Based on the color, what is the composition of this rock?
a. ultramafic
b. mafic
c. intermediate
d. felsic

Charles Machakwa

Charles Machakwa

Numerade Educator

Problem 54

Type the following coordinates into the search bar in Google Earth: $645845.54$ N $164307.04$ W. Zoom in to an eye elevation of $\sim 12979$ ft for a closer look. Based on the color, what is the composition of this rock?
a. ultramafic
b. mafic
c. intermediate
d. felsic

Charles Machakwa

Charles Machakwa

Numerade Educator