Challenge Questions Blog

Challenge Questions

Stop in and exercise your brain. Talk about this month's Challenge from Specs & Techs or similar puzzles.

So do you have a Challenge Question that could stump the community? Then submit the question with the "correct" answer and we'll post it. If it's really good, we may even roll it up to Specs & Techs. You'll be famous!

Answers to Challenge Questions appear by the last Tuesday of the month.
  Next in Blog: Water's Edge: Newsletter Challenge (03/15/05)
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North American Lakes Question

Posted February 09, 2005 2:51 AM

Paddy O'Flanigan writes:
Is there a geological / plate tectonics reason why all the really big lakes in North America seem to line up?

See map

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Steve
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Join Date: Jan 2005
Posts: 381
Good Answers: 8
#1

Well, it ain't plate tectonics

02/09/2005 2:33 PM

The U.S. and Canada are both on the North American plate. Besides, I think "line up" depends which map projection you choose to use. The map will look different under different projections. There's a good explanation of how to translate spherical maps onto a plane surfaces here
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MechHead
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Posts: 2
#2

Glaciers retreat

03/21/2005 3:01 PM

Glaciers are responsible for the formation of the Great Lakes Region. As they retreated, the glaciers eroded softer rocks (sedimentary) which formed the basins that filled with water.

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  Next in Blog: Water's Edge: Newsletter Challenge (03/15/05)
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