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.
VIII-Metals-A-Steel-1 THE MANUFACTURE OF STEEL Steel refers to any iron-carbon alloy, although steels usually contain other elements as well. In New Zealand steel is made by BH P NZ at Glenbrook, where about 90% of New Zealandâs annual steel requirements are produced.III-Metals-A-Steel-1 THE MANUFACTURE OF STEEL Steel refers to any iron-carbon alloy, although steels usually contain other elements as well. In New Zealand steel is made by BH P NZ at Glenbrook, where about 90% of New Zealandâs annual steel requirements are produced.