Which situation came first for explores

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

What was a common theme of folk and rock music created by the 1960s counterculture? a. nonviolence b. hate c. self-denial d. aggression

Who was the washington lawyer who watched the bombardment of fort mchenry from a british ship and wrote a poem about it? a. francis scott key b. benjamin banneker c. william clark d. zebulon pike