Structural Geology

Question 1

The orientation in space of a line or plane.

Answer 1

Attitude

Question 2

By convention, the attitude of a __________ is expressed as its strike and dip

Answer 2

Plane

Question 3

The attitude of a __________ is expressed as trend and plunge

Answer 3

Line

Question 4

The horizontal angle between a line a specified coordinate direction, usually true north or south

Answer 4

Bearing

Question 5

The compass direction or azimuth

Answer 5

Bearing

Question 6

The bearing of a horizontal line contain within an inclined plane

Answer 6

Strike

Question 7

A line of equal elevation on a plane

Answer 7

Strike

Question 8

There are an __________ number of parallel strike lines for any inclined plane

Answer 8

infinite

Question 9

Vertical angle between an incline plane

Answer 9

Dip

Question 10

A horizontal line perpendicular to its strike

Answer 10

Dip

Question 11

The direction of ___________ can be thought of as the direction water would run down the plane

Answer 11

Dip

Question 12

The bearing of a line

Answer 12

Trend

Question 13

Non - horizontal lines trend in the down plunge direction

Answer 13

Trend

Question 14

The vertical angle between a line and the horizontal

Answer 14

Plunge

Question 15

Angle measured within an inclined plane between a horizontal line and the line in question.

Answer 15

Pitch

Question 16

Also called Rake

Answer 16

Pitch

Question 17

Vertical angle between an inclined plane and a horizontal line that is not perpendicular to the strike of the plane

Answer 17

Apparent Dip

Question 18

For any inclined plane except a vertical one, the true dip is always ____________ than any apparent dip

Answer 18

greater

Question 19

Two ways of expressing the strikes of planes and trends of lines

Answer 19

1. Azimuth Method
2. Quadrant Method

Question 20

Method based on a 360 clockwise circle

Answer 20

Azimuth

Question 21

Method based on four 90 quadrants

Answer 21

Quadrant Method

Question 22

4 Major techniques for solving Apparent Dip Problems

Answer 22

1. Orthographic Projection
2. Trigonometry
3. Alignment Diagrams (nomograms)
4. Stereographic Projection

Question 23

This method is particularly suitable when very small dip angles are involved

Answer 23

Trigonometric Solution

Question 24

A method that is more time consuming but it helps you to develop the ability to visualize in three dimensions and to draw precisely

Answer 24

Orthographic Projection

Question 25

Method that usually involve three variables that have a simple mathematical relationship with one another

Answer 25

Alignment Diagrams

Question 26

A property of matter and can be defined as the ratio of mass to a unit volume of matter

Answer 26

Density

Question 27

Units of Density

Answer 27

1. g/(cm)^3
2. kg/(m)^3
3. lb/(inch)^3

Question 28

Formula of Density

Answer 28

Mass / Volume

Question 29

Measure of density relative to the density of a reference substance.

Answer 29

Specific Gravity

Question 30

Most common reference for specific gravity

Answer 30

pure water

Question 31

If a material has a specific gravity less than ______, it will float on water

Answer 31

1

Question 32

Specific gravity is also known as

Answer 32

Relative Density

Question 33

Formula for Specific Gravity

Answer 33

Density of Substance / Density of Preference