Which product, when improperly disposed of, can lead to ground and water contamination?

Used motor oil is a significant contaminant when improperly disposed of, as it contains heavy metals, hydrocarbons, and other toxic substances that can leach into soil and groundwater. When motor oil is poured down drains, on the ground, or in landfills, it can create serious environmental hazards. Even small amounts of used motor oil can severely impact water quality, harming aquatic ecosystems and posing health risks to humans and wildlife.

In contrast, recyclable plastics, organic compost, and household recyclables are usually managed in ways that mitigate their environmental impact. Recyclable plastics are designed to be processed again into new products, reducing waste and pollution when handled correctly. Organic compost, when appropriately managed, enriches the soil and promotes healthy ecosystems rather than leading to pollution, while household recyclables contribute to resource efficiency and sustainability when recycled properly. Hence, used motor oil stands out as a hazardous material that can cause significant ground and water contamination if not disposed of responsibly.