Rain mixes with which substances to become acidic?

Which roman emperor was responsible for a major shift in the dominate religious attitude of the roman empire?

In your local newspaper you read an editorial supporting a local building initiative that will cost the town million of dollars

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal