Ngwá ọrụ egwu ala ọkwa ụlọ ọrụ

N'ịbụ onye a rụpụtara maka ndị na-ahụ maka mbara ala, ọnyà a dị arọ nwere agụba a kpụrụ akpụ nke na-eguzogide nrụrụ n'okpuru oke nrụgide. Sistemụ njirimara akara akara na-enye ohere maka ịhazi ụdị ika, yana 24 iberibe kwa katọn nkwakọba ihe na-eme ka ọ bụrụ ebe nchekwa dị mma. Ikike mmepụta kwa ụbọchị nke nkeji 10,000 na-ekwe nkwa inye ya na-agbanwe agbanwe maka nnukwu ọrụ ugbo.