A change of the gravity field that varies slowly over distances much larger than the thickness of the layer where the mass moved can be represented by a change of surface density () on a thin shell at the Earth’s surface. The equivalent water height is the thickness of fresh water with the same surface density:
বইগুলো এখনো বাংলা ভাষায় পাওয়া যায় না — ইংরেজি সংস্করণ দেখানো হচ্ছে।
Earth and Space Sciences · পরিভাষা