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North American Continent Is a Layer Cake, Scientists Discover


World  (tags: North America, Continent, Layer Cake, Scientists, Discovery, environment )

Anna
- 1461 days ago - sciencedaily.com
The North American continent is not one thick, rigid slab, but a layer cake of ancient, 3 billion-year-old rock on top of much newer material probably less than 1 billion years old, according to a new study by seismologists at the University of California



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Comments

gail dair (0)
Friday August 27, 2010, 12:12 am
thanks Anna
 

Ana S. (66)
Friday August 27, 2010, 12:20 am
Thanks!
 

Valerie S. (70)
Friday August 27, 2010, 5:55 am
Very cool, noted, thanks!
 

William K. (328)
Sunday August 29, 2010, 1:33 pm
Thank you so much for posting this! I have bookmarked this and will use this in a class that I teach. Interesting how it seems to not follow the Law of Superposition; however, it probably does not contradict this law, as it reveals the scale at which tremendous geological forces have been operating.
 
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