Which of the following is NOT a water pollutant ?

Glacier

The correct answer is Option (2) - Glacier

Glacier is not a water pollutant. Glaciers are large masses of ice that originate on land. While the meltwater from glaciers can sometimes contain small amounts of minerals or debris, glaciers themselves are not considered pollutants. In fact, glacial meltwater is often a source of fresh water for many regions.