Rocks That Exhibit Ductile Strain Were Probably Deformed
Choose one answer.
at the surface of the earth.
when they were cold.
when the stress was applied very rapidly.
at a depth within Earth at elevated temperatures.
Incorrect
If rocks exhibit ductile behavior when exposed to compressive stress, they generally will form
Choose one answer.
normal faults.
folds.
reverse faults.
joints.
Incorrect
Which of the following types of strain does not result in permanent deformation?
Choose one answer.
tension
elastic strain
plastic strain
brittle strain
Incorrect
Faults are geologic structures that result from which type of strain?
Choose one answer.
a. brittle strain
b. ductile strain
c. elastic strain
plastic strain
Incorrect
Question 5
In the Lesson 4 Topic 2 video, "Measuring Earthquake Intensity and Magnitude," you were able to see that the rupture from the 1906 earthquake traveled from mile marker 80 to mile marker 100 in 10 seconds. At what speed did the 296 miles of San Andreas Fault rupture during the 1906 earthquake?
Choose...
2 miles per second
b. 200 miles per second
c. 2 miles per hour
d. 2,000 miles per secong
Incorrect
Question 6
What happens to existing oceanic crust as magma extrudes and solidifies at an oceanic ridge?
Choose one answer.
a. The crust breaks in half and moves away from the ridge.
b. The crust crumples as it encounters resistant, older and cooler rocks on either side of the ridge.
c. The crust subducts beneath the ocean floor and returns to the mantle.
d. The crust melts because of the intense pressures at the volcanically active zone.
Incorrect
Question 7
The deepest earthquake foci occur at ____ plate boundaries.
Choose one answer.
a. convergent
b. divergent
c. transform fault
d. subvergent
Incorrect
Question 8
Accreted terranes are characteristic features of many
Choose one answer.
a. hot spots.
b. divergent plate boundaries.
c. transform faults.
d. convergent plate boundaries.
Incorrect
Question 9
Shakemaps, which present a visual image of the relative amount of shaking in…
Some of the grains weather to a pale green colour. In thin section, quartz is the major grain type (~50%) with some microcline (~5%) and some rock fragments (~1%) all in a fine matrix which consists of quartz and/or feldspar, mica and some calcite cement. The majority of the grains have a red-brown altered rim. The rock fragments are possibly reworked sediments" (p. 13). Lettergesh Analysis by Farrell indicates that this