WaterPollution

______________________ is the buildup of pollutants at higher levels of the food chain.

• porosity
• water pollution
• wastewater
• biomagnification

______________________ is the process of removing the salt from ocean water.

• water pollution
• point source pollution
• desalination
• porosity

______________________ is water waste discharge from a single source.

• nonpoint source pollution
• wastewater
• point source pollution
• pathogen

______________________ is an area of the earth’s surface from which water percolates (drips) down into an aquifer.

• porosity
• recharge zone
• surface water
• biomagnification

Sewage treatment plants can be sources for all of the following EXCEPT

• plant nutrients
• heat
• infectious agents
• pharmaceuticals 

A likely source for radioactive materials would be 

• medical research facilities
• landfills
• cancer
• acids

Examples of materials that contain plant nutrients are

• sewage and fertilizers
• inorganic and organic chemicals
• radioactive materials and heat
• pesticides and infectious agents

Eutrophication is caused by

• plant nutrients
• inorganic chemicals
• organic chemicals
• sediment

Two pollutants that lower dissolved oxygen are

• heat and plant nutrients
• radioactive and organic chemicals
• infectious wastes and sediment
• fertilizer and inorganic chemicals

If Biological Oxygen Demand is high, then DO will

• decrease
• increase
• be produced
• be constant