Answer:
Ceramics, limestone, stream sediments
Step-by-step explanation:
MgO Magnesium oxide is an inorganic component that occurs in nature as a mineral periclase it is mostly used as a liquid medium. and has nonmedical uses an used as a heat resistant agent in wires. It has poor water solubility used for food and drugs owning to its crystalline structure. Also used as a protective coating in plasma displays.