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.
Best Answer: Quarters, dimes, and half dollars are cupro-nickel clad. Each coin has a copper core and an outer layer, the âclad,â made of 75 percent copper and 25 percent cupro-nickel alloy. Nickels are made from the same 75-25 alloy. The Golden Dollar is also a clad coin. The alloy layers on each side of the copper core are manganese brass, a golden-colored material composed of 77% copper, 12% zinc, 7% manganese, and 4% nickel. The cent, once a copper coin, is now composed of copper-plated zinc.