the reason that that they use that
type of metal is that its cheaper
Yes, they metal used is called an "sacrificial anode".
Zinc is often used as a sacrificial metal on iron.
Magnesium and zinc are often used
I've never heard that exact phrase used, but I'm guessing you're talking about a sacrificial anode. This is a piece of more active metal that's electrically connected to a piece of metal you want to protect; the sacrificial anode corrodes instead of the less active metal.
Sacrificial protection is only effective if the metal used for sacrificial protection is more reactive than Iron in the reactivity series. Since gold is one of the least reactive metals in the reactivity series, it would not get oxidized in the place of Iron. A more reactive metal than Iron, e.g. Zinc, is used as the Zinc metal would oxidize in the place of iron, thus preventing Iron from rusting.
name 4 clamps used for metal fabrication industry?
Iron.
Its used in your rectal cavity
geometry is used in construction by using angles, paralell lines and ect.
it can be used for metal etching
it is used in sacrificial ceremonies it is used in sacrificial ceremonies
yes they can but construction workers perfer transition metals