H. Write True if the following statement is correct and False if not about the effects and changes in the materials in the
absence and presence of oxygen.

11.Iron and nails when exposed to moisture may develop rust

12. The process of burning materials with the aid of oxygen is conduction.

13. The presence or absence of oxygen in the materials may result in the melting of materials.

14.Combustion occurs when oxygen combines with another substances like fuel and produces fire with heat and light.

15.We can prevent rusting of materials made of iron by washing the materials after using​