Concept #3 Quiz

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Chapter 10

Concept #3 Quiz

Choose the best possible answer to the following questions about Key Concept 3 "Mapping geologic structures."

folds in an outcrop (left) and at the scale of the state of Pennsylvania (right)

This activity contains 6 questions.

Which of the following is NOT true about rock structures?

Structures are generated by processes of deformation.Structures are mapped based upon their appearance in “outcrops,” small exposed parts of larger structures.Structures are described in terms of orientation and geometry.Structures occur from minute fractures to immense faults that are plate boundaries.Structures are usually horizontal, undisturbed, unbroken, and unbent.

What are outcrops, and why do structural geologists study them?

Outcrops are sites where bedrock is exposed, so the shape of the structure larger than the outcrop can be determined.Outcrops are sites where bedrock is covered by vegetation or sediment, thus concealing the structures necessary for study.Structural geologists are required to study outcrops in order to study very small-scale structures in individual rocks.Outcrops are loose blocks where structures are found in close proximity, therefore allowing structural geologists a bigger picture regarding the big-scale structures in the region.

What two measurements are used to establish the orientation of deformed strata?

temperature and pressurebrittle and ductile strike and dipfold and fault

Identify the measurements used by geologists to describe the orientation or attitude of a rock layer or fault by selecting the correct response. (Orientation measurements diagram, Copyright © Prentice Hall, Inc.)

The letters A through D appear on an image associated with this question.

This question presents 4 items numbered 4.1 through 4.4. Each item is presented with a pulldown menu containing the letters A through D. For each item below, use the pull-down menu to select the letter that labels the correct part of the image.

4.1 line parallel to "strike"
4.2 amount of "dip"
4.3 direction of "dip"
4.4 strike and dip symbol used for mapping

Which of the following describes best the difference and relation between “strike” and “dip” of a stratum? Choose all that apply.

Strike and dip are always perpendicular to each other.Strike is a vertical line with a compass direction, whereas dip is a horizontal line that has an angle relative to north. Strike is a horizontal line with a compass direction, whereas dip is an angle measured vertically downward from horizontal.Strike and dip are always parallel to each other.

What is inferred from the orientation of strata as measured in the field? Choose all that apply.

orientation and shape of the larger-scale structure can be establisheda reconstruction of the pre-erosional structures and an interpretation of the subsurface geometrya reconstruction of the orientation of the structure prior to plate convergence is obtainable.the types of structures within small parts of the rocks are revealed by their orientation.

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