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.
SUBJECT: Science