It depends on the type e.g. iron comes from an ore which is dug out of the ground where as steel is a mixture of iron and a tiny amount of carbon, this is known as an alloy.
An ore is dug out of the ground and is the melted in a furnace, then to remove the oxygen carbon is added as this new bond of carbon and oxygen is stronger then iron and oxygen, this then separates in the furnace at different levels and can be poured off.
Imagine it like oil in water the oil rises to the top.
Not all robots are made of metal but the majority of them are made of metal.
Metal door locks are made of metal.
She was made of metal... lots and lots of metal.
they are made out of metal metal
Metal wasn't made it was discovered.
metal is made out of ore
wood and metal and stuff. metal it's made from metal you idiot
they are made out of metal such as metal in metal mixed with metal and metal with loads of metal and metal and you make street car my secret ingreidant.
it was made from a metal
Their are no objects made of metal, anything that claims to be made of metal is a talking object, and that's weird.
It is made of metal because metal is the best conductor of heat.
ceramic is not made of metal. Ceramic objects are made of clay.