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Which era does the rock from the Canadian Shield date back to A Precambrian B Paleozoic C Mesozoic D Cenozoic
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Which era does the rock from the Canadian Shield date back to

A Precambrian

B Paleozoic

C Mesozoic

D Cenozoic

User Tyler Pantuso
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1 Answer

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A Precambrian the Canadian shield dates back almost 4 billion years ago about the same time as the Precambrian eon. 
User Zantier
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