What is a consequence of acid rain that results from sulfur dioxide mixing with rain?

• A. Lowering the pH in ponds, thus affecting water temperature
• B. Lowering the pH in ponds, thus limiting the survival of many organisms
• C. Raising the pH in ponds, thus encouraging the growth of organisms
• D. Depleting atmospheric carbon dioxide available for photosynthesis

Answer: (B)

The correct answer identifies a significant consequence of acid rain, which occurs when sulfur dioxide (SO2) combines with moisture in the atmosphere to form sulfuric acid. This acid rain results in a lower pH level in bodies of water, such as ponds.

When the pH of pond water decreases, it becomes more acidic. This change poses a serious threat to aquatic organisms. Many species, including fish and invertebrates, have specific pH tolerance levels. A lower pH can interfere with their physiological processes, including reproduction and metabolism, ultimately leading to decreased survival rates. Additionally, acidic conditions can also harm sensitive species and alter the overall biodiversity of the ecosystem. Therefore, this consequence of acid rain not only affects water quality but also has broader implications for the health and stability of aquatic ecosystems.