Currently, most hydrogen is made this way from natural gas. An electrical current can also be used to separate water into its components of oxygen and hydrogen. This process is known as electrolysis. Some algae and bacteria, using sunlight as their energy source, even give off hydrogen under certain conditions.
Originally, metal roofs were made of corrugated galvanized steel: a wrought ironâsteel sheet was coated with zinc and then roll-formed into corrugated sheets. Another approach is to blend zinc, aluminum, and silicon-coated steel.
Many things that are made of metals may, in fact, be made of mixtures of at least one metal with either other metals, or with non-metals. 1  These mixtures are called alloys. Some common alloys are: 2  Steel (iron and carbon) (Carbon is a non-metal) 3  Brass (copper and zinc) 4  Bronze (copper and tin) 5  Duralumin (aluminium and copper)