opanthon
opanthon opanthon
  • 24-02-2017
  • Biology
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What causes a continental shield to form?

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amospark0967
amospark0967 amospark0967
  • 24-02-2017
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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