Ⅱ ʻO ka ventila o kaʻu ma lalo, ma muli o ka hana mining a me ka mineral oxidation a me nā kumu ʻē aʻe, e loli ke ʻano o ka ea, e hōʻike nui ʻia e like me ka emi ʻana o ka oxygen, ka piʻi ʻana o nā kinoea ʻona a me nā mea ʻino, ka hui ʻana o ka lepo mineral, ka mahana, ka haʻahaʻa, ka loli kaomi, etc. ʻO kēia mau mele ...
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