What type of rain forms when industrial gas emissions combine with water?

Acid rain forms when sulfur dioxide and nitrogen oxides—emitted by industrial processes and vehicle exhaust—react chemically with water vapor in the atmosphere. This process results in the formation of sulfuric and nitric acids, which then mix with rainwater. When this acidic precipitation falls to the ground, it can have harmful effects on the environment, such as damaging forests, acidifying lakes and streams, and harming wildlife.

In contrast, drizzle refers to light rain with small drops, freezing rain occurs when raindrops freeze upon contact with cold surfaces, and thunderstorm rain is associated with storms that produce heavy precipitation and thunder. These other types of rain do not involve the chemical reactions that lead to the acidity characteristic of acid rain. Hence, the correct answer is accurately identified as acid rain, distinguishing it from the other forms that are unrelated to industrial gas emissions.