Human activity causes changes to the groundwater and surface water in a watershed. Which change to groundwater or surface water is classified as a chemical change? A. Concrete streets and parking lots cause more water to remain surface water instead of absorbing into the ground to become groundwater.

B. Hydroelectric dams built on rivers create lakes upstream of the dams and variable flow downstream.

C. Industrial waste that is dumped in a river causes acidic conditions that cause damage to fish digestive systems.

D. Rainwater collects in drainage ditches and flows to nearby lakes, increasing the water volume in lakes.