The two most persistent sources of oil pollution that keep oil in the marine environment for sustained periods are:

Question

Quizplus · Accepted Answer

Natural seepage releases oil into the marine environment continuously, while urban runoff also contributes to oil pollution through accidental spills, oil leaks from cars, and other sources. Both sources can result in sustained oil pollution in the marine environment. The other options mainly involve accidental events, and while they can contribute to oil pollution, they are not as persistent as the ongoing release of oil from natural seepage and urban runoff.

The Two Most Persistent Sources of Oil Pollution That Keep