Which geologic principle is the reason rock layers typically form parallel to each other?

Cross-cutting relationships

Original horizontality

Superposition

Unconformities

Question

Which geologic principle is the reason rock layers typically form parallel to each other?

 Cross-cutting relationships

 Original horizontality

 Superposition

 Unconformities

anonymous · Answer

Are you in Earth Science??
I just did this lesson in the beginning of the year :)
I'm postive it's not the law of cross-cutting relationships. 
However, I'm torn between Original horizonality and superposition.

anonymous · Answer

I'm leaning more toward Steno's law of Original horizonality. I wish I could tell you more :(

anonymous · Answer

Thanks :)

anonymous · Answer

Its original horizonality to  anyone whos curious (: