Zinc and aluminium are generally used in salt water, where the resistivity is generally lower. Typical uses are for the hulls of ships and boats, offshore pipelines and production platforms, in salt-water-cooled marine engines, on small boat propellers and rudders, and for the internal surface of storage tanks.ince the operation of a galvanic anode relies on the difference in electropotential between the anode and the cathode, practically any metal can be used to protect some other, providing there is a sufficient difference in potential. For example, iron anodes can be used to protect copper.
The Element. Water is one of the four classical nature elements along with fire, earth and air, and is bound to the others through Quintessence. Because of water's abundance and it's fundamental purpose in life, the ability to manipulate it grants a Guardian of this element a great variety of ability and power.
As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice; and gaseous state, steam (water vapor).It also exists as snow, fog, dew and cloud. Water covers 71% of the Earth's surface. It is vital for all known forms of life.he collective mass of water found on, under, and over the surface of a planet is called the hydrosphere. Earth's approximate water volume (the total water supply of the world) is 1,338,000,000 km 3 (321,000,000 mi 3).