Firn is snow that has survived at least one melt season and is being compacted into ice: denser than snow, still permeable to air. Pore close-off is the point in its compaction, at a density of about , where the pores between the grains are sealed into bubbles and the air in them is cut off from the atmosphere.
বইগুলো এখনো বাংলা ভাষায় পাওয়া যায় না — ইংরেজি সংস্করণ দেখানো হচ্ছে।
Earth and Space Sciences · পরিভাষা
Firn; pore close-off কী?
অন্য নাম: firn · pore close-off