Chapter 15

Question 1

What is stress measured by?

Answer 1

Force per unit area

Question 2

What is strain when referred to in the context of rocks

Answer 2

Change in size volume or shape of a body or rock unit in response to stress.

Question 3

What are tensional stress

Answer 3

A stress due to a force pulling away on a body.

Question 4

Elastic

Answer 4

Deformed material goes back to it’s original shape after being stretched.

Question 5

Ductile

Answer 5

Capable of being molded and bent under stress.

Question 6

What is a Geologic Map?

Answer 6

A map representing the geology of a given area.

Question 7

What is a strike?

Answer 7

The compass direction of a line formed by the intersection of an inclined plane with a horizontal plane.

Question 8

What is the angle of dip?

Answer 8

A vertical angle measured downward from the horizontal plane to an inclined plane.

Question 9

What is the direction of dip?

Answer 9

The compass direction in which the angle of dip is measures. Usually the downhill direction.

Question 10

What is included in a geologic map?

Answer 10

1. Ore deposits
2. Geologic structures
3. Rock types

Question 11

What are folds in the context of rocks?

Answer 11

Bend in layered bedrock.

Question 12

What are the two types of rock folding?

Answer 12

Anticline

Syncline

Question 13

What is unique about Anticline folding?

Answer 13

A fold shaped like an arch in simpiliar words if it was a radio wave it would be the peek.

Question 14

What is unique about Syncline folding?

Answer 14

A fold shaped like a U or the trough of a radio wave.

Question 15

what is a limb in a fold

Answer 15

Portion of a fold shared by an anticline and a syncline.

Question 16

What is an axial plane?

Answer 16

A plane containing all of the hinge lines of a fold. Or a cross section of the peak and troph.

Question 17

What is a source rock?

Answer 17

A rock containing organic matter that is converted to petroleum by burial and other post depositional changes.

Question 18

What are Plunging Folds?

Answer 18

A fold in which the hinge line is not horizontal. It looks like a horseshoe

Question 19

What is a structural dome?

Answer 19

A structure in which beds dip away from a central point aka a bosi pattern.

Question 20

What is an asymmetric fold?

Answer 20

Any fold that is not vertical or tipped over.

Question 21

What is an Recumbent fold?

Answer 21

Folds that are overturned to the point were they are basically horizontal.

Question 22

What Is the difference between a structural basin and a structural dome?

Answer 22

in a structural dome the oldest rocks are in the middle while a structural basin has the youngest rocks exposed in the center.

Question 23

What is an isoclinal forl(tight)

Answer 23

A fold were the folded limbs are nearly parallel to each other.

Question 24

What is an isoclinal forl(tight)

Answer 24

A fold were the folded limbs are nearly parallel to each other.

Question 25

What is a joint in bedrock

Answer 25

A fracture or crack in bedrock along which essentially no displacement has occurred.

Question 26

What is a joint set in the bedrock?

Answer 26

Joints oriented in one direction approximately parallel to one another.

Question 27

What is a fault in bedrock?

Answer 27

A fracture in bedrock along which movement has taken place.

Question 28

What are the 4 types of faults?

Answer 28

1. Reverse Fault
2. Normal Fault
3. Strike slip fault
4. Oblique-Slip Fault

Question 29

What is a thrust fault

Answer 29

A reverse fault in which the dip of the fault plane is at a low angle to horizontal. it faults at a very sharp angle that is almost horizontal.

Question 30

What is a strike-Slip fault

Answer 30

A fault in which movement is parallel to the stricke of the fault surface.

Question 31

What is a Graben when it comes to falts?

Answer 31

When a divergent plate plate boundery creates a trench at a falt