That statement is not true. While volcanic eruptions can contribute to acid rain, it's human activities that are the primary cause of acid precipitation.

Here's a breakdown:

* Volcanic eruptions: Volcanoes release sulfur dioxide (SO2) into the atmosphere, which can react with water and oxygen to form sulfuric acid, a major component of acid rain. However, volcanic eruptions are relatively infrequent and localized events.

* Human activities: The burning of fossil fuels (coal, oil, and natural gas) is the main source of sulfur dioxide and nitrogen oxides (NOx) that lead to acid rain. These gases are released from power plants, factories, and vehicles.

Here's why human activities are the bigger factor:

* Scale: Human activities release far more sulfur dioxide and nitrogen oxides into the atmosphere than volcanic eruptions.

* Persistence: While volcanic emissions are temporary, human activities continuously release pollutants, contributing to persistent acid rain problems.

Therefore, while volcanic eruptions can contribute to acid rain, it's human activities that are the primary and more significant cause of this environmental problem.