Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: A na-agbasa ihe dị ka ugwu na ndịda n'akụkụ ọwụwa anyanwụ nke Osimiri Hooghly, Kolkata dị n'ime ala Ganges Delta nke ọwụwa anyanwụ India ihe dị ka 75 km (47 mi) ọdịda anyanwụ nke ókèala mba na Bangladesh; elu obodo ahụ bụ 1.5<unk>9 m (5<unk>30 ft). Ihe ka ukwuu n'obodo ahụ bụbu ala mmiri na-adọkpụ bụ́ nke e mere ka ọ dịghachi mma ruo ọtụtụ iri afọ iji nabata ọnụ ọgụgụ na-arịwanye elu nke ndị mmadụ. Ebe ndị fọdụrụ na-emepebeghị emepe, nke a maara dị ka Ebe Ọwụwa Anyanwụ Kolkata Wetlands, bụ nke a kpọrọ "ala mmiri nke mba ụwa" site na Ramsar Convention (1975). Dị ka ọtụtụ n'ime Indo-Gangetic Plain, ala na mmiri bụ isi na-esite na mmiri. Kolkata dị n'elu "Bengal basin", nke dị n'elu ugwu. Bengal basin nwere ngalaba atọ: shelf ma ọ bụ ikpo okwu dị na ọdịda anyanwụ; etiti etiti ma ọ bụ shelf / mkpọda mkpọda; na akụkụ miri emi dị na ọwụwa anyanwụ na ndịda ọwụwa anyanwụ. Kolkata dị n'elu akụkụ ọdịda anyanwụ nke mpaghara hinge nke dị ihe dị ka kilomita 25 n'obosara na omimi nke ihe dị ka mita 45,000 (148,000 ft) n'okpuru elu. Mpaghara shelf na hinges nwere ọtụtụ mmebi, n'etiti ha ụfọdụ na-arụ ọrụ. Mkpokọta ọkpụrụkpụ nke sediment n'okpuru Kolkata bụ ihe fọrọ nke nta ka ọ bụrụ 7,500 m (24,600 ft) n'elu crystalline basement; nke ndị a n'elu 350<unk>450 m (1,150<unk>1,480 ft) bụ Quaternary, na-esote 4,500<unk>5,500 m (14,760<unk>18,040 ft) nke Tertiary sediments, 500<unk>700 m (1,640<unk>2,300 ft) ọnyà na-asa nke Cretaceous ọnyà na 600<unk>800 m (1,970<unk>2,620 ft) Permian-Carboniferous Gondwana nkume. A na-eji ụrọ, silt, na ọtụtụ ọkwa ájá na gravel eme ihe. A na-etinye sediment ndị a n'etiti akwa ụrọ abụọ: nke dị n'okpuru na omimi nke 250 <unk> 650 m (820 <unk> 2,130 ft); nke dị n'elu bụ 10 <unk> 40 m (30 <unk> 130 ft) n'ịdị arọ. Dị ka Ụlọ Ọrụ Na-ahụ Maka Ụkpụrụ Ndị India si kwuo, n'ihe e ji amata otú ala ọma jijiji nwere ike isi mee, obodo ahụ dị n'ebe ala ọma jijiji na-eme nke atọ.  Ajụjụ: Na mpaghara ole ka obodo ahụ dị?
mpaghara ala ọma jijiji III