The area undergroud that contains groundwater is called a(n) _____.

When an aquifer is used up, it is said to be _____.

An unusually long period of little rainfall is a(n) _____.

An intestinal infection marked by severe diarrhea is called _____.

Cleaning by separating out pollutants or impurities is called ______.

The process by which toxic chemicals build up through the food chain is called _____.

Thermal pollution occurs when _____ is added by humans to the water.

Eutrophication can cause depletion of _____ in the water.

Waste from living organisms is called _____ waste.

Hepatitis is a disease that damages the _____.

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