What is foliation?
a. intergrown mineral crystals formed from cooling magma
b. randomly oriented mineral crystals placed due to confining pressure
c. thin, parallel layers of clay sediments that have been compressed
d. roughly parallel layers of mineral crystals aligned perpendicular to the direction of pressure

The correct answer is D.

Explanation:

Foliation is the arrangement in sheets that acquires the material that forms certain rocks when they are subjected to great pressures.

The sheet structure of rocks that have undergone metamorphism due to pressure, which can be vertical and derive from burial, or have another direction and is due to the convergence of plates or the action of faults. The layers are formed parallel to the direction of the cut, or perpendicular to the direction of higher pressure.

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