Asked by Manuel De Sousa on Jun 24, 2024
Verified
Which of the following does NOT help define foliation in metamorphic rocks?
A) a dominant orientation of crystals, such as mica
B) light- and dark-colored bands
C) flattened shapes of deformed objects, such as pebbles
D) crystals that grow in a random orientation
E) all of these
Foliation
The planar arrangement of textural or structural features in metamorphic rocks and certain igneous rocks.
Dominant Orientation
The primary direction in which a geological formation or feature is aligned.
Deformed Objects
Items that have been altered from their original shape or structure through pressure or stress.
- Identify and describe the main features of metamorphic rocks, including foliation and nonfoliation.
Verified Answer
NN
Nicolas NunezJun 30, 2024
Final Answer :
D
Explanation :
Foliation in metamorphic rocks is defined by features such as a dominant orientation of platy minerals (like mica), the presence of light- and dark-colored bands, and the flattened shapes of deformed objects. Crystals that grow in a random orientation do not contribute to foliation, as foliation implies some degree of alignment or layering.
Learning Objectives
- Identify and describe the main features of metamorphic rocks, including foliation and nonfoliation.