The term COMMON SEASONING can be solved by the four-letter word SALT. SALT is a mineral composed primarily of sodium chloride, a chemical compound belonging to the larger class of salts; SALT in its natural form as a crystalline mineral is known as rock SALT or halite. It is an essential nutrient for human health and is used as a seasoning in many cuisines around the world. SALT is also used in many industrial processes, and it is a major source of sodium and chloride ions in the environment.