Question 1

Granite is a type of rock that forms deep underground from magma that cools very slowly.What type of rock is granite?

Accepted Answer

A)  igneous 
B)  sedimentary 
C)  metamorphic

Question 2

What information can geologists discover by analyzing a thin section?

Accepted Answer

A)  the abundance of different elements in the rock 
B)  what chemical constituents make up the rock 
C)  what minerals make up the rock and how grains connect to one another 
D)  the arrangement of atoms in the rock

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 in a rock. 
D)  proportion of chemicals that make up a rock.

Question 4

Which type of rock forms from the freezing (solidification)of a melt?

Accepted Answer

A)  metamorphic 
B)  crystalline 
C)  sedimentary 
D)  igneous

Question 5

What is a thin section? How is it made and what is it used for?

Accepted Answer

The answer of What is a thin section? How is...

Question 6

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

Accepted Answer

A)  metamorphic 
B)  sedimentary 
C)  crystalline 
D)  igneous

Question 7

What is the basis for classification of rocks into igneous,metamorphic,and sedimentary?

Accepted Answer

A)  how old the rocks are 
B)  how the rocks formed 
C)  the types of minerals in the rocks 
D)  the grain size of the rocks

Question 8

How would you tell if a rock is crystalline?

Accepted Answer

A)  It contains crystals that have been cemented together. 
B)  It does not contain crystals at all. 
C)  It contains interlocking crystals. 
D)  It contains all one type of crystal.

Question 9

In what kind of geologic setting are igneous rocks likely to form?

Accepted Answer

A)  volcanic arc 
B)  deep ocean 
C)  subduction zones 
D)  passive margin

Question 10

What kind of information can an electron microprobe provide about rocks?

Accepted Answer

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

Exam 20: Introducing Rocks