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Search "Shield"
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Shield | |
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About 2 pages (722 words) in 2 products |
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Encyclopedia and Summary Information
summary from source:
 Shield Information
671 words, approx. 2 pages
 A shield is generally a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas. In all cases, the age of these rocks is greater than 570 million years and sometimes dates back 2 to 3.5... 
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Shield | |
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About 2 pages (722 words) in 2 products |
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