Due to gravity, layers of ___ originally form OA) rock; vertically
OB) rock; at an angle
Oc) sediment; vertically
OD) sediment; horizontally

D) sediment; horizontally

Explanation:

The gravitational force is a force of attraction, which attract particles or objects in the neighborhood of the earth towards it surface. This is the major cause of the horizontal layers originally formed by sediments.

The sediment is formed one layer after the other horizontally, due to gradual deposition of its particles. And the sediment is made compact due to the force of gravity which compresses the layers together.

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.