Question

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

Explanation:

In an experiment, the independent variable is what is changed or manipulated, and the dependent variable is what is measured as a result of the change in the independent variable. For the dry - sand samples, if one parameter is changed between the two samples, it could be the mass (since it's mentioned that there are mass groups). The other independent variable represented as three types within each mass group could be the type of material. The response that is measured, the dependent variable, is the temperature over time as it is affected by the changes in the independent variables.

Answer:

The independent variable, the one that is intentionally manipulated between the two samples, is the mass of the dry - sand samples.
The other independent variable is the type of material.
The dependent variable is the temperature over time.