 nala ihe onwunwe esịnede nkume iberibe na ahịhịa nke na-isi ewepụtara decomposed basait a ezi grained ọchịchịrị mgbawa ugwu nkume ọgaranya ígwè na magnesium, nke dị na-emeghe ka mmetụta nke chemical weathering na a igwe nke ebe okpomọkụ 