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আবহবিকারপ্রাপ্ত শিলা ক্ষয় পেয়ে অপসারিত হলে নীচের আদি শিলা ভূপৃষ্ঠে উন্মােচিত হয় বা দৃশ্যমান হয়, এই উন্মােচনের প্রক্রিয়াই হল নগ্নীভবন।
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আবহবিকারপ্রাপ্ত শিলা ক্ষয় পেয়ে অপসারিত হলে নীচের আদি শিলা ভূপৃষ্ঠে উন্মােচিত হয় বা দৃশ্যমান হয়, এই উন্মােচনের প্রক্রিয়াই হল নগ্নীভবন।