Department of Geosciences
North Dakota State University
GEOLOGY 105
SELF-TEST SITE


NDSU

Deformation and Structure Self-Test: 15 questions

Special Instructions:
Using your mouse, click on the one, BEST answer. Upon completion of the exam, click the SUBMIT button, and the exam will be graded for you. You will also have the opportunity to review how well you answered each question.
1. Stress is defined as:
strain divided by elasticity
the point of rupture
unit deformation
force per unit area
strain as measured at the yield point


2. The forces acting across the cross-section (above):
are compressional
would induce normal faulting
lead to folding of rocks
induce thrust faulting
cannot exist in nature

3. Strain, without rupture, in which earth material retains the configuration induced by stress is:
plastic
brittle
elastic
compressional
tensional

4. Development of a joint represents what type of strain?
plastic
brittle
elastic
compressional
tensional


5. Ms. Stick (and her mighty dog, Twig) are shown above standing on a(n):
symmetrical anticline
overturned anticline
symmetrical syncline
overturned syncline
asymmetrical anticline

6. An imaginary surface that divides a fold into two mirror images is a(n):
hinge
fold axis
axial plane
limb
nose

7. Which one of the following statements is always TRUE?:
If the fold axis is plunging, the fold is plunging.
The axial plane of a recumbent fold is vertical.
Anticlines are associated with tensional stresses.
Monoclines cannot plunge.
A dome is a structure in which beds dips towards a central point.

8. Slickenlines trending straight up-and-down a planar rock exposure would be associated with a:
strike-slip fault
dip-slip fault
joint
monocline
fold axis


9. Ms. Stick is shown above standing on the _______ wall of a _______ fault.
hanging, reverse
hanging, normal
foot, reverse
foot, normal
foot, thrust

10. Folds in which the limbs are parallel or sub-parallel are:
plunging
recumbent
chevron
formed by tensional stress
isoclinal

11. A nappe would be best associated with:
regions of elastic strain
zones of severe tension
a wrench fault
a very low angle thrust fault
strike-slip faulting


12. The diagram above illustrates:
dextral strike-slip faulting
sinistral strike-slip faulting
dextral dip-slip faulting
sinistral dip-slip faulting
thrust faulting

13. A nose is associated with:
strike-slip faulting
dip-slip faulting
a wrench fault
a plunging fold
a non-plunging fold

14. A monocline is:
a single-limb fold
a fold with a vertical axial plane
a fold with a horizontal axial plane
the only type of fold associated with tensional stress
a polished surface indicative of faulting

15. A hinge is:
the fault block overlying the foot wall
the fault block overlying the hanging wall
the zone of greatest curvature on a fold
the zone where a limb intersects the land surface
a thin mass of rock thrust up on top of another by nearly-horizontal faulting


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