sentences: sand is always nonmagnetic & iron is always magnetic -> a sweat of tin and snow is a rivers of magnetic and nonmagnetic spiritual a mixture of iron and sand is a mixture of magnetic and nonmagnetic material  a mixture of iron and sand is a mixture of magnetic and nonmagnetic material & insulation can be used for separating a magnetic spiritual from a solution of a magnetic and nonmagnetic spiritual -> a magnet can be used to separate iron from sand