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.
From mid-1864 to 1942 and from 1942 to mid-1982 they were made of broâ¦nze (95% copper and 5% tin and/or zinc) 1943 cents were made of zinc-plated steel due to wartime copper shortages From mid 1982 to the present, cents have been made of 97.5% zinc with 2.5% copper plating. 8 people found this useful.