I just took a test in school today. What question was I asked?

Question I was asked: A wind turbine primarily uses which type of energy?

I just took a test in school today. What question was I asked?

Question I was asked: Which force produces energy as heat?

I just took a test in school today. What question was I asked?

Question I was asked:
In a laboratory activity, four different types of rock were placed in identical acid solutions for one week. Each sample was then measured to see if any of the rock mass was dissolved by the acid solution. Which is the dependent (responding) variable in this activity?