Background Paragraph: Marine pollution is a generic term for the entry into the ocean of potentially hazardous chemicals or particles. The biggest culprits are rivers and with them many agriculture fertilizer chemicals as well as livestock and human waste. The excess of oxygen-depleting chemicals leads to hypoxia and the creation of a dead zone.Marine debris, which is also known as marine litter, describes human-created waste floating in a body of water. Oceanic debris tends to accumulate at the center of gyres and coastlines, frequently washing aground where it is known as beach litter. 
Story: Two rivers, The Minninnippi and The Cedar, flow into the same ocean. The Minninnippi is surrounded almost entirely by farm lands due its location in a flat area of the country that sees regular rainfall. The majority of these farms will have runoff from their crop soil flow into the river. The Cedar is located mostly inside an unpopulated forest. Currently, not much industrialization or settling by humans has happened near The Cedar.
Dead zones will be less prevalent closer to which river? Dead zones will be more prevalent closer to which river? Is it more or less likely that the ocean water near The Cedar will experience hypoxia? Is it more or less likely that the ocean water near The Minninnippi will experience hypoxia? Which river is less responsible for marine pollution flowing into the ocean? Which river is more responsible for marine pollution flowing into the ocean? Will the ocean water near The Minninnippi or The Cedar have less oxygen? Will the ocean water near The Minninnippi or The Cedar have more oxygen? Will there be less fish near The Minninnippi or The Cedar? Will there be more fish near The Minninnippi or The Cedar?