Question 1

Geologists sometimes use analytical equipment to help identify rocks.One commonly used machine is the electron microprobe,which focuses a beam of electrons on a sample to determine ________.

Accepted Answer

A)  the amount of radioactive minerals
B)  how atoms are arranged
C)  the atomic weight
D)  the chemical compositionE) A) and B)
F) None of the above

Question 2

Which is a characteristic used to classify a rock?

Accepted Answer

A)  mineral stability
B)  rock texture
C)  water content
D)  degree of weatheringE) A) and C)
F) A) and B)

Question 3

Composition describes the ________.

Accepted Answer

A)  degree of compaction and cementation in a rock
B)  arrangement of minerals in a rock
C)  presence of layers of minerals in a rock
D)  chemical makeup of a rockE) B) and D)
F) A) and D)

Question 4

A piece of concrete from a driveway is NOT considered a rock because it ________.

Accepted Answer

A)  is made of one mineral
B)  does not contain minerals
C)  is unconsolidated
D)  is man-madeE) None of the above
F) B) and C)

Question 5

Rocks are ________ and thus not man-made.

Accepted Answer

A)  coherent
B)  synthetic
C)  rare
D)  naturalE) B) and C)
F) All of the above

Question 6

List the three main rock groups and give a brief description of how each is formed.

Accepted Answer

Igneous rocks are formed by the cooling ...

Question 7

What is the difference between a rock that is cemented and a rock that is crystalline?

Accepted Answer

A)  A rock that is cemented contains rounded grains that are held together by cement,whereas a crystalline rock contains angular grains held together by cement.
B)  Crystalline rocks contain minerals,while cemented rocks contain rock fragments;both are held together by static forces between grains.
C)  Minerals are held together as interlocking pieces in a cemented rock,whereas grains are held together by minerals precipitated in pore spaces in a crystalline rock.
D)  Minerals are held together as interlocking pieces in a crystalline rock,whereas in a cemented rock the grains do not fit together like puzzle pieces and instead are held together by cement.E) A) and D)
F) B) and C)

Question 8

The picture below shows a(n) ________ of rock that geologists use to determine the minerals in the rock.

Accepted Answer

A)  hand sample
B)  thin section
C)  outcrop
D)  X-rayE) B) and C)
F) None of the above

Question 9

Imagine you are holding a rock composed of small sand grains cemented together.What subclassification of sedimentary rock is this?

Accepted Answer

A)  clastic
B)  chemical
C)  igneous
D)  crystallineE) A) and D)
F) A) and B) A

Question 10

Why do geologists use thin sections of rocks?

Accepted Answer

A)  to determine if the rock is molten
B)  to identify foreign substances
C)  to identify the minerals
D)  to determine the arrangement of atomsE) A) and B)
F) B) and C)

Question 11

Which one of the pictures does NOT show (a) rock(s) ?

Accepted Answer

A)  Figure A
B)  Figure B
C)  Figure C
D)  Figure DE) None of the above
F) A) and C)

Question 12

Igneous rocks form from ________.

Accepted Answer

A)  heat and pressure applied to a rock
B)  precipitation of minerals out of a solution
C)  sediments cemented together
D)  molten rock cooling and forming crystalsE) C) and D)
F) A) and D)

Question 13

A(n) ________ takes extremely high resolution images that can be used to determine the elements in a rock.

Accepted Answer

A)  petrographic microscope
B)  scanning electron microscope
C)  X-ray diffractometer
D)  photomicrographE) None of the above
F) A) and B)

Question 14

Looking at a ________ helps geologists identify minerals and classify rocks.

Accepted Answer

A)  thin section
B)  micro section
C)  thin slide
D)  micro slideE) B) and C)
F) A) and B) A

Question 15

Which of the images below shows a rock? Explain your reasoning.

Accepted Answer

Figure B shows a rock because ...

Question 16

A(n) ________ of minerals forms a rock.

Accepted Answer

A)  compilation
B)  aggregate
C)  mass
D)  assemblyE) None of the above
F) A) and B)

Question 17

Is a piece of concrete a rock? Why or why not?

Accepted Answer

No,concrete is a man...

Question 18

What type of texture is shown in the photomicrograph?

Accepted Answer

A)  foliation
B)  crystalline
C)  sedimentary
D)  clasticE) A) and B)
F) All of the above

Question 19

Which of the following describes a rock?

Accepted Answer

A)  a pile of damp sand still holding the form of a bucket
B)  a collection of crystals that fit together like puzzle pieces
C)  cobblestones cemented together to form a walkway
D)  a layer of mud at the bottom of a dry river bedE) C) and D)
F) B) and C) B

Question 20

A(n) ________ material is held together,solid,and must be broken apart to separate it into smaller pieces.

Accepted Answer

A)  unconsolidated
B)  paved
C)  coherent
D)  buttressedE) A) and B)
F) A) and C)

Exam 20: Interlude A: Rock Groups

Geologists sometimes use analytical equipment to help identify rocks.One commonly used machine is the electron microprobe,which focuses a beam of electrons on a sample to determine ________.

Correct AnswerverifiedShow Answer

Which is a characteristic used to classify a rock?

Correct AnswerverifiedShow Answer

Composition describes the ________.

Correct AnswerverifiedShow Answer

A piece of concrete from a driveway is NOT considered a rock because it ________.

Correct AnswerverifiedShow Answer

Rocks are ________ and thus not man-made.

Correct AnswerverifiedShow Answer

List the three main rock groups and give a brief description of how each is formed.

Correct AnswerverifiedIgneous rocks are formed by the cooling ...View AnswerShow Answer

What is the difference between a rock that is cemented and a rock that is crystalline?

Correct AnswerverifiedShow Answer

The picture below shows a(n) ________ of rock that geologists use to determine the minerals in the rock.

Correct AnswerverifiedShow Answer

Imagine you are holding a rock composed of small sand grains cemented together.What subclassification of sedimentary rock is this?

Correct AnswerverifiedA

Why do geologists use thin sections of rocks?

Correct AnswerverifiedShow Answer

Which one of the pictures does NOT show (a) rock(s) ?

Correct AnswerverifiedShow Answer

Igneous rocks form from ________.

Correct AnswerverifiedShow Answer

A(n) ________ takes extremely high resolution images that can be used to determine the elements in a rock.

Correct AnswerverifiedShow Answer

Looking at a ________ helps geologists identify minerals and classify rocks.

Correct AnswerverifiedA

Which of the images below shows a rock? Explain your reasoning.

Correct AnswerverifiedFigure B shows a rock because ...View AnswerShow Answer

A(n) ________ of minerals forms a rock.

Correct AnswerverifiedShow Answer

Is a piece of concrete a rock? Why or why not?

Correct AnswerverifiedNo,concrete is a man...View AnswerShow Answer

What type of texture is shown in the photomicrograph?

Correct AnswerverifiedShow Answer

Which of the following describes a rock?

Correct AnswerverifiedB

A(n) ________ material is held together,solid,and must be broken apart to separate it into smaller pieces.

Correct AnswerverifiedShow Answer

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Igneous rocks are formed by the cooling ...
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A

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A

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Figure B shows a rock because ...
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No,concrete is a man...
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B

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