Air and water pollution are very big problems along the great lakes of canada. where does most of this pollution come from?
a) the united states
b) the trans-canadian highway
c) factories in montreal and toronto
d) canal traffic along the st. lawrence river

The correct answer is C) factories in Montreal and Toronto.

Air and water pollution are very big problems along the Great Lakes of Canada. Most of this pollution comes from factories in Montreal and Toronto. The types of pollution in the Great Lakes have been caused by human activity such as"industrial waste, sewage disposal, runoff.

Human activity has represented severe damage to the environment. In the case of the Great Lakes in, those above-mentioned reasons have causes of pollution for an important source of freshwater in Canada and the United States. These are the largest lakes in the country and are the Lake Michigan, Lake Uron, Lake Superior, Lake Ontario, and Lake Eire.