sentences: a transformation is a mean of mist preposition & color is a kind of physical / visual property ->  specks of different colors are different substances  specks of different colors are different substances & a kind is made up of yolk freezes and white female -> the powder is made up two different substances the powder is made up two different substances  the powder is made up two different substances & an middle is formed by one or more collision combined together physically -> the powder is a mixture