What percentage of Canada's surface freshwater is contained in the Great Lakes? 

A)  about 30% 
B)  about 50% 
C)  about 70% 
D)  about 90%

Surface Freshwater

Bodies of water found on the Earth's surface, such as rivers and lakes, that contain low concentrations of salt.

Great Lakes

A group of five large freshwater lakes located on the border between the United States and Canada, known for being the largest group of freshwater lakes by surface area in the world.

Canada

A country located in the northern part of North America, known for its vast landscapes, multicultural diversity, and strong national healthcare system.