Ibisobanuro: Ibuye ryibirunga bakunze kwita pumice cyangwa basalt basalt, ni ubwoko bwibikorwa nibidukikije.Irimo imyunyu ngugu na microelements nyinshi, nka sodium, magnesium, aluminium, silikoni, calcium, titanium, manganese, fer, nikel, cobalt na molybdenum n'ibindi ...
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