Geopuzzle #16

This weeks challenge comes via fellow Scibling Martin of Aardvarchaeology:

I’ve noticed something funny about the map of North America. The Great Lakes in the US form the end of a straight line of huge lakes extending north-west across Canada. Could you please tell me how that line of lakes formed?

It looks like he has a point:

canadasat.jpg

Now, this is one of those situations where I can make an educated guess about the answer, but I’m neither sure if it’s right or if I’m grasping the full story. If I’m even approaching a clue, this (right click to download) or this may prove helpful. Or not. Either way, get guessing.

Categories: geology, geopuzzling

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