STRESS ON ROCKS

Deformation and fold mountain building can occur along transform faults where:

• a. Motion along the fault is very slow

• b. Motion along the fault is relatively fast

• c. The fault curves, causing the rocks on either side to extend

• d. The fault curves, causing the rocks on either side of the fault to compress

Which of the following best describes the “deformation” of rocks?

• a. deformation produces weaknesses in rocks that stress acts upon when continents collide

• b. structures are affected when deformation causes forces to act on rocks, producing stress

• c. generally the changes in size, shape, orientation, or position of a rock mass

• d. specifically the formation of axial planes of folds

How is “stress” related to “force”? Choose the best answer.

• a. Stress is a measure of how concentrated the force is.

• b. Stress is the force applied to a given area.

• c. Stress is an accelerated force, driven into a rock.

• d. Stress is the same as a force but applied to geology.

Which of the following types of tectonic forces tends to push two sides of a body in opposite directions so that they slide horizontally past one another?

• a. tensional forces

• b. shearing forces

• c. compressive forces

• d. none of these

The San Andreas Fault in California is an example of a _____ fault in a _____ plate boundary.

• a. a normal fault in a transform plate boundary

• b. a strike-slip fault in a convergent plate boundary

• c. a reverse fault in a transform plate boundary

• d. a strike-slip fault in a transform plate boundary

• e. a normal fault in a convergent plate boundary

Which of the following statements about rock deformation is false?

• a. deep crustal rocks are more likely to deform ductility than shallow crustal rocks

• b. hotter rocks are more likely to deform ductility than cooler rocks

• c. most sedimentary rocks are more deformable than igneous rocks

• d. rocks under low confining pressure are more likely to deform ductility than rocks under high confining pressure