Tetanus vaccine can help prevent tetanus disease, commonly known as lockjaw.. Tetanus is a serious disease that causes painful tightening of the muscles, usually all over the body. It can lead to locking of the jaw so the person cannot open his mouth or swallow. Tetanus leads to death in about one in ten cases.
The most abundant dissolved salt in ocean water is sodium chloride. It is a colorless crystalline compound with the chemical formula of NaCl.
After hydrogen and oxygen, the two most abundant or common elements dissolved in seawater are sodium and chloride, which combine to form salt. The salinity of seawater is measured by grams of salt per liter of water, with a typical reading of approximately 35 grams per liter, or 35 percent.