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| 7100153969 | Dissolved oxygen (D.O.) | Which substance can be increased with aquatic plants, turbulent water, or lower temperature in water? | 0 | |
| 7100153970 | Nitrates & Phosphates | Which substance, if in excess, can lead to algae blooms that lower the dissolved oxygen as decomposition by bacteria breaks down dead algae? | 1 | |
| 7100153971 | Chlorine | Which substance is added to drinking water and sewage treatment effluent in order to kill disease-causing pathogens (can also lead to formation of carcinogenic THM's)? | 2 | |
| 7100153972 | Sediment/turbidity | Which substance is the largest (by mass) water pollutant coming mainly from soil erosion? (can heat up water and decrease sun penetration for aquatic plants) | 3 | |
| 7100153973 | Mercury | Which substance can bioaccumulate in organisms and biomagnify up the food chain - gets into air from burning coal then settles into water and turns into a toxic form that in aquatic organisms and has neurological impacts in humans? | 4 | |
| 7100153974 | Fecal coliform | Which substance can be present in dangerous levels due to sewage effluent or manure lagoons on farms and can expose people to disease-causing organism? (Chicago now starting to disinfect sewage to lower this in the river :D!) | 5 | |
| 7100153975 | BOD (biological oxygen demand) | Which refers to the amount of oxygen required by organisms and can be increased when biodegradable organic matter gets into rivers and lakes? | 6 | |
| 7100153976 | H+ ions | Which substance can be increased in water with the byproducts of NOx and SOx in the air from burning fossil fuels? | 7 | |
| 7100153977 | Atrazine | Which substance has been shown to have gender-bender effects (endocrine disruptor or estrogen-mimic) in frogs and other organisms? | 8 | |
| 7100153978 | Lead | Which substance is a neurotoxin that can have cognitive and behavioral impacts, especially in children? (can get into water from corroded plumbing pipes with drinking water) | 9 | |
| 7100153979 | Heat/thermal pollution | Which comes from nuclear power plants and some industrial plants and can negatively impact aquatic organisms that can't tolerate the change? | 10 | |
| 7100153980 | PCB's | Which substance is a banned but persistant organic pollutant that is still present in waterways and sediment - has a wide variety of reproductive, developmental, and carcinogenic health effects? | 11 |
