What is the leading source of pollutants found in rivers surveyed in1998?

Question

Me and my co workers are playing a game to help raise money for the red cross, and we would like some help on finding this question so we can earn points, the more points the more money the game gets and the more money the game gets we mail the points to our local red cross, but we only do this at our red cross because we give our own money, Thanks:)
P.S. This is not a joke.

Answer 1

Depending on where the location is.

Answer 2

Sediment is the number one polluter of our rivers and streams. Seems silly that it's just dirt, but it makes sense. The more concrete you have covering ground surfaces, the less water can filter into the soil so it runs off in large quantities, taking massive amounts of soil with it as it goes. This finally gets deposited into our waterways and pollutes them along with the chemical residues that the water carried from power plants, large feedlot operations, farming practices, landfills, etc.

Answer 3

In India, the pollutants are mostly industry-based eg. Sulphur, Mercury etc.

Answer 4

mercury