<Li> <P> A severely rusted lock </P> </Li> <P> A severely rusted lock </P> <Li> <P> A rusted but otherwise intact Pineapple grenade that was previously buried in the ground near Opheusden, Netherlands </P> </Li> <P> A rusted but otherwise intact Pineapple grenade that was previously buried in the ground near Opheusden, Netherlands </P>

What is the equation for rusting of iron