Which method is NOT used for disposing of nonhazardous solid waste?

The method that is not used for disposing of nonhazardous solid waste is dumping in the ocean. This practice is disallowed and heavily regulated due to its significant environmental impact, including harm to marine life and ecosystems. In many countries, it is illegal to dump solid waste, including nonhazardous materials, in bodies of water.

In contrast, landfilling, burying in trenches, and incineration are established methods for disposing of nonhazardous solid waste. Landfills are designed to safely contain waste, while burying in trenches creates a method of waste management that minimizes exposure to the environment. Incineration is also a common technique where waste is burned at high temperatures, reducing its volume and eliminating harmful pathogens, although it does require stringent emission controls to manage air quality.

Thus, the answer clearly identifies an inappropriate and harmful waste disposal method while highlighting the accepted methods used for handling nonhazardous solid waste.