Nqe lus piav qhia: Volcanic pob zeb feem ntau hu ua pumice lossis porous basalt, nws yog ib yam khoom siv thiab ib puag ncig.Nws muaj ntau ntau cov zaub mov thiab microelements, xws li sodium, magnesium, txhuas, silicon, calcium, titanium, manganese, hlau, npib tsib xee, cobalt thiab molybdenum thiab lwm yam ...
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