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21 November, 15:21

What causes a continental shield to form?

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  1. 21 November, 15:45
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    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 billion years.
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