2.34 describe how the rusting of iron may be prevented by grease, oil, paint, plastic and galvanising

2.34 •to prevent rust, you prevent iron contacting water and oxygen 

        •grease, oil, paint, plastic and a coated metal less reactive than iron prevent rust

        •painting/plastic: ideal for big and small structures. Can be decorative 

        •oiling/greasing: used for moving parts like chains