Geologists working for the environmental protection agency monitor surface waters at sites across the country to determine the effects of acid rain on aquatic ecosystems. What type of information would the geologists most likely track?

pH levels
Climate patterns
Human activity
Gas emissions

The geologists would most likely track pH levels in the surface waters to determine the level of acidity resulting from acid rain. They may also track gas emissions to identify sources of pollutants contributing to acid rain. Additionally, they may monitor climate patterns to understand how weather conditions impact the formation and transport of acid rain. Tracking human activity in the area could also be important in identifying potential sources of pollution that contribute to acid rain.