1.
Contamination of streams, lakes, or oceans
2.
Pollution from a single, identifiable source like a factory pipe
3.
Pollution from many diffuse sources, like runoff from many farms
4.
Water that contains waste from homes or industry
5.
When humans add excess nutrients like phosphorus to water, causing algae blooms
6.
A temperature increase in a body of water caused by human activity
7.
The buildup of pollutants at higher levels of the food chain
8.
Contamination of the atmosphere by harmful substances
9.
A pollutant put directly into the air by human activity
10.
A pollutant that forms when primary pollutants react with other substances
11.
Any material that is potentially harmful to health or the environment
12.
Tiny particles of liquid or solid matter suspended in the air
13.
A mix of pollutants that creates a hazy, brown/grey "fog" over cities
