Chap 15

Question 1

Geologic structures

Answer 1

produced as rocks change shape and orientation in response to applied stress

Question 2

structual geology

Answer 2

The study of shapes arrangements and interrelationships of rock units and the forces that cause them

Question 3

stress

Answer 3

Force per unit area, eg tectonic forces and confining pressure from burial
basic types are: compressive tensional and shear

Question 4

Strain

Answer 4

A change in size or shape in response to stress

Question 5

Compresive stress

Answer 5

pushed together or squeezed

Question 6

Shear stress

Answer 6

Stresses act parallel to a plane

Question 7

Strike

Answer 7

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

Question 8

dip angle

Answer 8

angle measured down from the horizontal plane to the bedding plane

Question 9

Folds

Answer 9

bends or wave like features in layered rock

Question 10

anticline

Answer 10

Shaped like an arch with oldest rocks in the center of the fold, layers dipping away from axis

Question 11

Syncline

Answer 11

shaped like a trough with the youngest rocks in the center of fold, layers dipping toward axis

Question 12

Hinge line

Answer 12

line of maximum curvature of a folded surface

Question 13

Axial plane

Answer 13

an imaginary plane containing all the hinge lines of a fold

Question 14

Structual dome

Answer 14

beds dip away from a center point

Question 15

structural basin

Answer 15

beds dip toward a center point

Question 16

fault

Answer 16

Fractures in bedrock along which sliding has taken plance

Question 17

Dip slip failt

Answer 17

movement parallel to dip or failt surface

Question 18

strike slip fault

Answer 18

oblique slip fault

Question 19

oblique slip fault

Answer 19

both dip and strike slip