Description the Canadian shield
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The Canadian Shield constitutes the largest mass of exposed Precambrian rock on the face of Earth. The region, as a whole, is composed of ancient crystalline rocks whose complex structure attests to a long history of uplift and depression, mountain building (orogeny), and erosion
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THE CANADIAN SHIELD CONSTITUTES THE LARGEST MASS OF EXPOSED PRECAMBRIAN ROCK ON THE FACE OF EARTH. THE REGION, AS A WHOLE, IS COMPOSED OF ANCIENT CRYSTALLINE ROCKS WHOSE COMPLEX STRUCTURE ATTESTS TO A LONG HISTORY OF UPLIFT AND DEPRESSION, MOUNTAIN BUILDING (OROGENY), AND EROSION.
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