water is a kind of substance & salt is a kind of pure substance ->  salt and water are two substances  salt and water are two substances & salt dissolves in water when they are combined ->  salt dissolving in water is an example of one substance being dissolved in another substance  salt dissolving in water is an example of one substance being dissolved in another substance & a solution is formed by one substance being dissolved in another substance ->  salt dissolving in water will form a salt water solution  salt dissolving in water will form a salt water solution & dissolving is an example of two substances being combined physically ->  salt dissolving in water is an example of two substances being combined physically  salt dissolving in water is an example of two substances being combined physically & an mixture is formed by two or more substances combined together physically -> salt water is a kind of mixture