Limestone is primarily composed of calcium carbonate (CaCO3), which is susceptible to chemical weathering by acid precipitation. Acid precipitation, mainly composed of sulfuric acid (H2SO4) and nitric acid (HNO3), can react with calcium carbonate through the following chemical reaction:

CaCO3 (limestone) + H2SO4 (sulfuric acid) → CaSO4 (gypsum) + H2O (water) + CO2 (carbon dioxide)

As a result of this reaction, the limestone rock undergoes chemical weathering, where the calcium carbonate is transformed into gypsum (calcium sulfate). The products of this reaction, gypsum, water, and carbon dioxide, are released into the environment.

Therefore, the correct answer is: Gypsum formation and its release into the environment.