Mostly it is iron or steel. This is coming from a 6th grader
Some nails are made of copper or brass. Also, some nails are galvanized to protect them from rust. There are also aluminum nails--they're used with vinyl siding and aluminum trim coil.
Sea water can rust nails or other metals.
Nails were historically made of iron by a local blacksmith. Nowadays, most nails are usually made in factories from steel wire, although they could also be made of aluminium, brass, or many other metals.
Nails rust because of O2 or oxygen, when it reacts with metals inside the nail
A nail is usually made of steel, or other metals such as brass or aluminium.
Screws need to be harder so they will not twist off when you apply torque to them.
Sure; nails are usually made from some metal, and all metals are conductors.
Shingles is a disease caused by a virus. There are no metals in this disease ROOFING shingles may be slate, wood, terra cotta tiles, fiberglass, asphalt or fiberglass. They rarely contain metals, but may be held in place with nails made of steel..
Not easily. The molecular size of heavy metals means the kidneys struggle to excrete them. Most heavy metals are stored in hair, finger nails and other body tissues. Many, such as copper, lead, iron, are toxic if ingested in large amounts.
You don't want stuff falling off your roof, so you don't want the nails to rust. Zinc, unlike other metals, will not rust, so you wrap the nail with a coat of zinc to prevent rusting.
salt water would rust a nail in roughly 2 hours as salt has a fast reaction to metals (nails).
It depends on which non metals you mean. The ability to scratch a material depends on its hardness relative to the material you use to scratch it with. With your nails you can scratch materials softer than your nails, like some plastics and minerals. But nothing can scratch in diamond because it's the hardest material there is, but in turn diamond can scratch all other materials, since they're softer that diamond including all metals and non metals. So although most metals are relatively soft, there are many non metals that are softer that some metals. Trivia: the softest metal is mercury with a hardness of 0 (it's liquid at room temperature) The hardest metal is carbon steel with a hardness of around 8 to 9 The softest mineral is talc with a hardness of 1 The hardest mineral is diamond with a hardness of 10 (a form of pure carbon)