Nkọwa: Nkume mgbawa ugwu nke a na-akpọkarị pumice ma ọ bụ porous basalt, ọ bụ ụdị ihe na-arụ ọrụ na gburugburu ebe obibi.Ọ nwere ọtụtụ mineral na microelements, dị ka sodium, magnesium, aluminum, silicon, calcium, titanium, manganese, iron, nickel, cobalt na molybdenum na ndị ọzọ ...
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