Question

what leads to pollution of oceanic waters on a large scales

Answer 1

Answer:

• The majority of pollutants that make their way into the ocean come from human activities along the coastlines and far inland.
• One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff.

Explanation:

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Answer 2

Answer:

The biggest culprit are rivers that empty into the ocean, and with it the many chemicals used as fertilizers in agriculture as well as waste from livestock and humans. An excess of oxygen-depleting chemicals in the water can lead to hypoxia and the creation of a dead zone.