yes, it's just that the metal becomes a new compound. It wouldn't be metal anymore.
The plural of rust is rusts. As in "a nail left in the open rusts easily".
a nail rusts
because its a chemical reaction
a penny
No. Iron rusts but it is not biodegradable.
a nail rusts
iron oxide
Salt water.
actually, it becomes darker. the nail will turn a brownish-blackish color.
A nail rusts through a process known as oxidation.
As the rust expands the nail will get slightly bigger then reach a point when starts to disintergrate.
Outside on wet soil