What is a PSA and how are they helpful?

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

What produces wave a)sound b) heats c)transfer of energy d)vibrations