Which geologic principle is the reason rock layers typically form parallel to each other? a. cross-cutting relationships. b. original horizontality. c. superposition. d. unconformities.

B. Original horizontality

Explanation:

     Original Horizontality Principle is the Relative Chronology Principle which states that sediments are always deposited in horizontal layers. Any geological phenomenon that changes the horizontality is always after sedimentation.

    In the Original Horizontality Principle, the original layers are horizontally separated by flat and parallel surfaces (stratification joints - surfaces that support the layers).

B. Original horizontality.

Explanation:

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