Unit Test Answers

The Karez well system _______.a.was the first known use of wellsb.was a postindustrial systemc.transported groundwater from a distanced.all of the above

Freshwater is used principally as drinking water.

Which of the following regulations is the primary law regarding water pollution?a.The Safe Drinking Water Actb.The Clean Water Actc.The Marine Protection, Research, and Sanctuaries Actd.WaterSense

Potable water delivery systems are characterized by _______.a.high infrastructure costsb.aqueductsc.glass bottlesd.rivers

Which of the following best describes the effects of water pollution on aquatic ecosystems?a.It can result in fish kills and restrictions on human consumption.b.It can change the physiology of fish.c.It can cause long-term alterations of aquatic ecosystems.d.All of the above

It is best to say that efficient plumbing _______.a.reduces water pollution by using less waterb.reduces water pollution by using cleaner waterc.increases water pollution by using more waterd.reduces water pollution by using dirty water

Which of the following practices could help reduce erosion of water banks?a.buffer stripsb.natural fertilizers and pesticidesc.decrease in fossil fuel emissionsd.all of the above

Which of the following is not an option for solving the world water crisis?a.desalinationb.finding new sources of freshwaterc.reducing overconsumptiond.wastewater treatment plants

What is the greatest use of groundwater?a.drinkingb.industryc.agricultured.recreation

Which of the following is true of salt lakes?a.The water flowing in to salt lakes comes directly from the ocean.b.Salt lakes are formed when river bends are cut off.c.The water flowing in to salt lakes contains minerals.d.Salt lakes do not experience shrinking due to erosion.

Human activity on land can have a profound influence on marine ecosystems.

Where is the water table located?a.10 ft below the surfaceb.below the saturated zonec.at the top of the saturated zoned.all of the above

Which of the following sources of pollution would be the most difficult to track and regulate?a.lawn fertilizer runoffb.a waste treatment plantc.a factoryd.a nuclear power plant

Access to potable water is most heavily limited by _______.a.moneyb.precipitationc.raw water suppliesd.climate

Which of the following statements about desalination is true?a.Desalination is less expensive than water reclamation.b.Desalination uses large amounts of energy.c.Desalination is the main process used to provide water for crop irrigation.d.All of the above

Increased awareness of water contamination can help reduce its effects.

The location of the water table is subject to change.

Which of the following best explains why humans need constant supplies of fresh water?a.Humans need a constant supply of water to provide them with essential vitamins.b.Humans need a constant supply of water to maintain proper hygiene.c.Constant supplies of freshwater are needed because body water is continually being lost.d.Constant supplies of freshwater are not actually necessary for survival.

Which of the following is a program rather than a law regulating water quality?a.The Safe Drinking Water Actb.The Clean Water Actc.WaterSensed.The Marine Protection, Research, and Sanctuaries Act

Which of the following statements regarding water conservation is not true?a.Only about 1% of Earth’s water supply is usable for human consumption.b.Over half of the states predict water shortages by 2013.c.While environmentally beneficial, water conservation is a costly endeavor.d.Failure to conserve water will lead to more water contamination.

Which of the following factors does not influence the level of the water table?a.pumpingb.time of yearc.pollutiond.none of the above

How does groundwater become polluted?a.Pollutants mixed with water pass through permeable layers above the aquifer.b.Factories dump their waste directly into aquifers.c.Refuse infiltrates the water table when garbage is dumped.d.All of the above

Which of the following best describes the availability of freshwater on Earth?a.Less than 1% of Earth’s water is liquid freshwater.b.More than two thirds of Earth’s freshwater is stored in glaciers and icecaps.c.99% of liquid freshwater on Earth is stored as groundwater.d.All of the above.

Which of the following does not represent an impact of recreational activity on springs?a.destruction of native vegetationb.wildlife disruptionc.decreased soil erosiond.water pollution

The Working for Water program helps conserve water by employing individuals to remove invasive plants.