Oasis
It is source of water in desert.
Oats
It is a food grain rich in fibre.
Omlette
It is a food item prepared from egg.
Ore
The minerals from which metals are obtained profitably and economically are called ores.
Oxides
Compounds in which oxygen is present along with one more element are called oxides.
Oxygen
It is an element. It symbol is O. It is essential for the survival of living beings. Almost 25% of air is oxygen.
Ozone
It is an allotrope of oxygen. Its symbol is O3. It is present in stratosphere and protect the earth from ultraviolet rays in the radiation emitted by Sun.
