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maria [59]
3 years ago
10

What causes a continental shield to form?

Biology
1 answer:
Phoenix [80]3 years ago
8 0
A shield<span> is generally a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that </span>form<span> 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.</span>
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