tract as in the dolichosaurs, are also noticeable in the aigialosaurs, though to a weaker extent; but what the aigialosaurs always lack is the deflection or folding-over of the tail which is common in the dolichosaurs.
Sodium chloride is an ionic compound that is produced by the bonding of sodium cations to chloride anions. This salt dissolves readily in water and forms crystals when in solid form. Uses of sodium chloride can be both commercial and biological.
Sodium and chlorine, hence the chemical formula NaCl. Salt is made up of Sodium chloride (NaCl), its solid form is formed by crystallisation that occurs when the NaCl in the water is left behind due to evaporation, this usually happens when water is left on rocks for a while- to every 3.78 litres there is 0.113g of NaCl (salt). I hope my answer has helped :)