What do huron erie michigan ontario and superior all have in common?

Huron, Erie, Michigan, Ontario and Superior are all lakes that are formed in the same way, thus have the same origin, they are all glacial lakes. These lakes formed on places where there were glaciers in the ice age. They were valleys filled with ice. Once the ice started melting they became lakes, lakes that got their water from glaciers.

Ithink it is space that makes up 70 percent

Answercompass direction;