The variables for part i of this experiment include the types of materials used in the cup, the masses of these materials, and their temperatures over time. use the drop-down menus to complete the sentences and identify the independent and dependent variables. the two dry sand samples are examined by changing one parameter. the independent variable, the one that is intentionally manipulated between the two samples, is the . besides the amount of material, there is also another variable that is manipulated within each of the two mass groups and represented as three types. this independent variable is the . in each case, the dependent variable, the one that you measure the response in, is the