1. Due to deposition of sediments in a valley for millions of years
  2. Due to accumulation of sediments in a geosyncline
  3. The plains were folded into mountains
  4. The sediments were folded into recumbent and nappe folds
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1 Answers

Answer: Option 2

Due to accumulation of sediments in a geosyncline fold mountains have enormous thickness of sedimentary rocks. The plains were folded into mountains and The sediments were folded into recumbent and nappe.

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