A caldera is a large basin-shaped volcanic depression, across and much wider than any vent within it, formed by the collapse of the ground into a shallow magma reservoir that an eruption has partly emptied.
বইগুলো এখনো বাংলা ভাষায় পাওয়া যায় না — ইংরেজি সংস্করণ দেখানো হচ্ছে।
Earth and Space Sciences · পরিভাষা