What is the Canadian Shield made of ?
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The Canadian Shield constitutes the largest mass of exposed Precambrian rock on the face of Earth. Encyclopædia Britannica, Inc. The resulting surface consists of rocky, ice-smoothed hills with an average relief of 30 metres (100 feet), together with irregular basins, which are mostly filled by lakes or swamps.
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It is made up of oldest known hard volcanic rocks in the
world
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