Exam 12: Water Resources

The amount of water underground is __________ percent greater than the amount of water above ground.

Pollutants that do not decay naturally in a reasonable amount of time are classified as __________.

Wastes from nuclear power plants are __________.

Excessive removal of ground water can cause __________, the sinking or settling of the Earth's surface.

Dams and reservoirs result in a net gain of surface water.

An example of nonpoint source of pollution is:

Subsidence of the Earth's surface:

Most irrigation water is consumed.

Radioactive wastes can be disposed of by incineration.

PCBs are troublesome water pollutants because they:

Current demands on the Colorado River exceed the total discharge of the river.

Any process that uses water and then returns it to Earth far from its source is __________.

A process that uses water and then returns it to the Earth locally is called __________.

If ground water is pumped faster than it can flow, a saltwater intrusion occurs.

Water used to flush a toilet in a city is pumped to a sewage treatment plant, purified, and discharged into a nearby stream.

__________ is the irreversible sinking or settling of Earth's surface.

During the first thirty years of the Clean Water Act, the total discharge of pollutants into the nations waters has __________.

Congress passed the __________ __________ __________ in 1972, mandating the cleaning of the nation's rivers, lakes, and wetlands.

The pollution of Love Canal was caused by:

Sewage can contain high concentrations of: