Fórmanse  pola

 oxidación  dos

 sulfuros  cando

Voornaamwoord

  estes

Bepaler

  entran

Werkwoord

  en

Aanneming

 contacto  co

  osíxeno

Selfstandige naamwoord

  do

  aire

Selfstandige naamwoord

.

They are formed by the oxidation of sulfides when they come in contact with air oxygen.

They are formed by the oxidation of sulfides when they come in contact with air oxygen.