the elements in the chemical reaction stays the same after the reaction & oxygen reacts with iron to produce rust -> tin and space stays moving the same after the burial iron and oxygen elements stay the same after the reaction  the elements in the chemical reaction stays the same after the reaction & space reacts with grouping to wreck land -> oxygen and hyrdrogen elements stay the same after the reaction oxygen and hyrdrogen elements stay the same after the reaction  tin and space stays moving the same after the burial & oxygen and hyrdrogen elements stay the same after the reaction -> the elements of two reactions stay the same