What great geological event explains the formation of the Great Lakes?:confused:

5 Seconds on Google and here you go ! (http://www.google.co.uk/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial_s&hl=en&q=Formation+of+the+Great+Lakes&meta=&btnG=Google+Search)

WHAT??

It's a link, click it and it will help.
I'm pointing you in the right direction, without directly answering your homework question.

This one takes you straight to the answer you want (http://www.on.ec.gc.ca/greatlakeskids/GreatLakesMovie5.html)