Question 1

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

Accepted Answer

A) thin section 
B) micro section 
C) thin slide 
D) micro slide 
A) thin section 
B) micro section 
C) thin slide 
D) micro slide A

Question 2

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) crystalline 
A) clastic 
B) chemical 
C) igneous 
D) crystalline A

Question 3

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 bed 
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 bed B

Question 4

Rocks are ________ and thus not man-made.

Accepted Answer

A) coherent 
B) synthetic 
C) rare 
D) natural 
A) coherent 
B) synthetic 
C) rare 
D) natural

Question 5

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-made 
A) is made of one mineral 
B) does not contain minerals 
C) is unconsolidated 
D) is man-made

Question 6

Which is a characteristic used to classify a rock?

Accepted Answer

A) mineral stability 
B) rock texture 
C) water content 
D) degree of weathering 
A) mineral stability 
B) rock texture 
C) water content 
D) degree of weathering

Question 7

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 rock 
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 rock

Question 8

What type of texture is shown in the photomicrograph?

Accepted Answer

A) foliation 
B) crystalline 
C) sedimentary 
D) clastic 
A) foliation 
B) crystalline 
C) sedimentary 
D) clastic

Question 9

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 crystals 
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 crystals

Question 10

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 11

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-ray 
A) hand sample 
B) thin section 
C) outcrop 
D) X-ray

Question 12

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

Question 13

A(n)________ of minerals forms a rock.

Accepted Answer

A) compilation 
B) aggregate 
C) mass 
D) assembly 
A) compilation 
B) aggregate 
C) mass 
D) assembly

Question 14

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

Accepted Answer

A) Figure A 
B) Figure B 
C) Figure C 
D) Figure D 
A) Figure A 
B) Figure B 
C) Figure C 
D) Figure D

Question 15

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 composition 
A) the amount of radioactive minerals 
B) how atoms are arranged 
C) the atomic weight 
D) the chemical composition

Question 16

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) buttressed 
A) unconsolidated 
B) paved 
C) coherent 
D) buttressed

Question 17

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) photomicrograph 
A) petrographic microscope 
B) scanning electron microscope 
C) X-ray diffractometer 
D) photomicrograph

Question 18

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

Accepted Answer

No,concrete is a man

Question 19

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. 
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.

Question 20

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

Accepted Answer

Figure B shows a rock because

Exam 20: Interlude A: Rock Groups

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

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

Which of the following describes a rock?

Rocks are ________ and thus not man-made.

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

Which is a characteristic used to classify a rock?

Composition describes the ________.

What type of texture is shown in the photomicrograph?

Igneous rocks form from ________.

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

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

Why do geologists use thin sections of rocks?

A(n)________ of minerals forms a rock.

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

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 ________.

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

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

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

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

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

The Earth in Context

The Way the Earth Works: Plate Tectonics

Patterns in Nature: Minerals

Up From the Inferno: Magma and Igneous Rocks

The Wrath of Vulcan: Volcanic Eruptions

Pages of Earth S Past: Sedimentary Rocks

Metamorphism: A Process of Change

A Violent Pulse: Earthquakes

Crags, cracks, and Crumples: Crustal Deformation and Mountain Building

Deep Time: How Old Is Old

A Biography of Earth

Riches in Rock: Energy and Mineral Resources

Unsafe Ground: Landslides and Other Mass Movements

Streams and Floods: The Geology of Running Water

Restless Realm: Oceans and Coasts

A Hidden Reserve: Groundwater

Dry Regions: The Geology of Deserts

Amazing Ice: Glaciers and Ice Ages

Global Change in the Earth System

Interlude B: A Surface Veneer: Sediments and Soils

Interlude C: The Rock Cycle

Interlude D: The Earth S Interior Revisited: Insights From Geophysics

Interlude E: Memories of Past Life: Fossils and Evolution

Interlude F: An Introduction to Landscapes and the Hydrologic Cycle

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