Choices: (1). Condensation (2). aqueous solution (3). streams (4). Pollution (5). evaporation (6). Organic compounds (7). vaporization (8). burning coal

Fact 1: Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain. Fact 2: Acid rain is precipitation which pH is 5.7 or lower. Given the two facts above, gases from what causes precipitation where the pH is 5.7 or lower?
Answer:
(8).