C. Nuclear to be honest, I don’t know, but I think this is the answer.
The Great Lakes were formed during the last ice age.
The arrival of the Europeans drastically changed the lives of the Natives due to the fact that the Europeans were coming to the Americas to modernize and spread European culture there. The Native Americans had been there for many years before and they did not believe in modernizing the way they lived. They had been the same for many years.
chemical weathering of rocks on the continents is one source of elements found in sea water.
