People
Air pollution causes acid to accumulate in rivers and lakes.
There are numerous causes of water pollution. Runoff from farms and factories will cause bodies of water to become unclean. Similarly, large amounts of litter, or people dumping trash into the water, can make ponds or lakes uninhabitable for animals and plants.
Gravity, of course. The fact that the upper great lakes are higher than the lower great lakes might explain it. Water falls over Niagra because it is higher where it comes from than where it goes to. Water flows down hill.
What will not reduce water pollution is constantly dumping garbage in to lakes and rivers.
what are some other water pollution causes
the Great Lakes are fresh water.( the largest fresh water lakes in the world.)
factory,oil,fuel
In 1972, Canada signed the Great Lakes Water Quality Agreement with the United States. This agreement aimed to address and improve the water quality of the Great Lakes by reducing pollution and promoting environmental protection. It marked a significant step in international cooperation to safeguard this vital freshwater resource.
thermal pollution
As suggested by the name, the Great Lakes are all lakes - bodies of fresh water. Seas are bodies of salt water.
The Great Lakes are freshwater bodies of water.
The Great Lakes are freshwater bodies of water.