Geology Cafe

Introduction to Geology

Quiz 6 - Tectonics

1. Continental crust rises above sea level because it is:
a. denser than ocean crust.
b. is more mafic in composition than ocean crust.
c. contains more granitic rocks than ocean crust.
d. none of the above.

2. Crustal compression is more likely to form:
a. normal faults.
b. thrust faults and reverse faults.
c. strike-slip and transform faults.
d. oblique slip and normal faults.

3. The measure of ground shaking describing the local severity of an earthquake in terms of its effects on the Earth’s surface and on humans and their structures is called:
a. earthquake magnitude.
b. Richter scale.
c. earthquake intensity.
d. P-waves and S-waves.

4. Rift valleys, like the Great African Rift Valley, form as a result of:
a. crustal compression.
b. crustal extension.
c. stress and strain.
d. ductile deformation.

5. An unconformity represents:
a. older rocks moved by thrust faults over younger rocks.
b. a gap in the sedimentary record that represents a period of erosion or non-deposition.
c. represents a boundary between a lava flow and an igneous intrusion.
d. represents rocks that have been folded by tectonic forces.

6. Anticlines, synclines, domes, and basins are examples of:
a. folds.
b. features formed by faulting.
c. occur only in igneous rocks.
d. none of the above.

7. On a reverse fault:
a. the hanging wall moves down relative to the foot wall.
b. the foot wall moves up relative to the hanging wall.
c. the foot wall moves horizontally relative the the hanging wall.
d. the hanging wall moves up relative to the foot wall.
e. none of the above.

8. "Strike and dip" represents:
a. a method to describe the orientation of geologic features such as joints, faults, or layers exposed on the earth surface.
b. is a method to help resolve a scientific dispute.
c. is a method perfected to study earthquake motion.
d. is a method to determine the composition of rocks and minerals found in fault zones.

9. Where a fault plane intersects the land's surface is called a:
a. joint.
b. fault line.
c. fault zone.
d. fault system.
e. earthquake fault.

10. Landscape features associated with strike-slip faults include:
a. offset streams.
b. linear valleys.
c. shutter ridges.
d. sag ponds.
e. all of the above.

Extra credit: The first to arrive at a distant location from an earthquake is:
a. a shear (S) wave.
b. a compression (P) wave.
c. a sound (S) wave.
d. a rupture.
e. none of the above.