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নদী-উপত্যকার ক্ষেত্রে সমােন্নতি রেখার ‘V’-এর তীক্ষ্ম বা ছুঁচালাে দিকটি উচ্চভূমির দিকে এবং স্পার-এর ক্ষেত্রে সমােন্নতি রেখার জিহ্বার অগ্রভাগ নিম্নভূমির দিকে বর্ধিত থাকে।
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Answer ( 1 )
নদী-উপত্যকার ক্ষেত্রে সমােন্নতি রেখার ‘V’-এর তীক্ষ্ম বা ছুঁচালাে দিকটি উচ্চভূমির দিকে এবং স্পার-এর ক্ষেত্রে সমােন্নতি রেখার জিহ্বার অগ্রভাগ নিম্নভূমির দিকে বর্ধিত থাকে।