Fa'amatalaga: Ma'a volcanic e masani ona ta'ua o le pumice po'o le basalt porous, o se ituaiga o mea aoga ma le siosiomaga.O loʻo i ai le tele o minerale ma microelements, e pei o le sodium, magnesium, alumini, silicon, calcium, titanium, manganese, iron, nickel, cobalt ma molybdenum ma isi ...
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