The total amount of water on the Earth ____________ from year to year and the hydrologic cycle ________________.
stays about the same; moves it from one place to another place
Transpiration is the way plants
return large amounts of water to the atmosphere.
liquid water turning to vapor well below boiling temperature.
Natural evaporation processes are mainly driven by
The process of _____________ explains why your ice cubes shrink when they have been left in the freezer for a long time.
The amount of water vapor that air can hold _________. Warm air is able to hold _____ humidity when compared to _____ air.
varies greatly; more; cold
Saturation point is the maximum amount of water vapor that
air at a certain temperature can hold.
Relative humidity is a measure of water vapor in air compared to the
maximum vapor air can hold at that temperature.
Condensation is the process of water molecules
aggregating when the saturation point is exceeded.
The dew point is
the temperature at which a certain concentration of water vapor will begin to condense.
Condensation nuclei such as smoke or dust can make water vapor
condense more easily.
The rainiest or snowiest zone on the mountain in the diagram above would be in the area marked
from A to B.
The rainshadow on the mountain in the diagram above would be in the area marked
from C to D.
Air moving in the direction indicated in the diagram above will become warmer as it moves from
B to D.
Air moving in the direction indicated in the diagram above will become dryer as it moves from
B to D.
Residence time of water in oceans is a measure of the
average amount of time a water molecule spends in the ocean.
The hydrologic compartment that contains the greatest amount of fresh water is
ice and snow.
Water enters groundwater by
The zone of saturation is the portion of groundwater where
all soil or rock pore spaces are filled with water.
The place where aquifers are most likely to be contaminated is at
The amount of water in aquifers in the United States is
over thirty times greater than all surface water in the United States.
22. The atmosphere has the greatest ________ of the earth's hydrologic compartments.
turnover rate and smallest water volume
A country's renewable water supplies are generally made up of
surface runoff and infiltration into accessible aquifers.
Which of the following factors is the most important factor in determining whether a country is "water rich" or "water poor"?
Renewable water supplies.
The United States has a drought cycle that brings dry periods about every ____ years.
Withdrawal is the total amount of water
taken from rivers, lakes or aquifers.
Technically speaking, when water is consumed it
is no longer available for other purposes.
Human water withdrawals have been increasing at about ___________ rate as worldwide population growth.
In general, water use in poor countries is dominated by
On the graph of domestic water use per person above, each letter represents a country. Which of the following is most likely?
A is the United States; B is China.
The Ogallala Aquifer supplies water to ___________ and once held more water than the surface water __________.
the central Plains states, in the world
Withdrawal of groundwater often causes subsidence, a situation where
porous rocks settle and ground level falls.
In some regions groundwater withdrawals can contribute to sinkholes, in which
empty underground caverns suddenly collapse.
Subsidence and sinkholes
are probably a permanent loss of an aquifer.
A method of increasing water supplies that has been successful, if expensive, is
desalinization by reverse osmosis.
Consequences of the Aswan High Dam in Egypt include
A. increase in the need for buying fertilizer. B. increase in the occurrence of schistosomiasis. C. decline in the Mediterranean fisheries. D. "increase in the occurrence of schistosomiasis" and "decline in the Mediterranean fisheries" are consequences of the Aswan High Dam in Egypt. E. All of these are consequences of the Aswan High Dam in Egypt.
All of these are consequences of the Aswan High Dam in Egypt.
The activity that uses the greatest share of US household water is
flushing the toilet.
Principal problems that have resulted from the construction of large dams include the relocation of people.
Many experts think that in the future, water conflicts will be a major cause of international conflict. Currently, however, there are no international conflicts over water.
Human activity such as deforestation can affect rainfall.
Charging a higher proportion of real costs rather than subsidies has led to water conservation.
Factories, sewage treatment plants, and oil wells are __________ sources of water pollution.
_________ sources of water pollution are relatively easy to monitor and regulate while _____________ sources of water pollution are difficult to monitor and cleanup.
The discharge from a nonpoint source of pollution is
highly seasonal in quantity.
____________ is to point source of water pollution as _____________ is to nonpoint source of water pollution.
Power plant effluent; golf course runoff
Atmospheric deposition of contaminants is an excellent example of
The water pollutant that most commonly threatens human health is
Coliform bacteria populations are routinely monitored in drinking water supplies, swimming pools, and at beaches because these bacteria
indicate the presence of feces in water.
On the graph of clean drinking water per person, each letter represents a country. Which of the following is most likely?
A is the United States; B is India.
High oxygen content in water is an indication that
water is clean enough to support game fish.
An oxygen sag occurs most often
immediately downstream of a pollution source.
In the diagram above, the horizontal (X) axis should be labeled
Distance from outfall pipe.
In the diagram above, which of the following units would probably be used to label the numbers on the horizontal (X) axis?
The most active decomposition occurs in the area marked _____ on the horizontal axis of the diagram.
0 to 1
In the diagram above, which of the following organisms would probably be found in the area marked 3 and higher?
mayfly and stonefly larvae
In the diagram above, which of the following organisms would probably be found in the area between 1 and 2?
When natural waters are overloaded with plant nutrients, such as nitrate and phosphate ions, they become
Cultural eutrophication results from
Algae blooms are a common problem in the Mediterranean Sea because of
heavy tourism and untreated sewage.
Toxic metals such as lead, cadmium, and mercury
can be toxic in extremely small quantities.
Which of the following are inorganic toxic substances sometimes found in water supplies?
salts and lead
Itai-Itai developed in Japanese people living near the Jintsu River. This disease was traced to
Rivers in California's dry agricultural valleys are often toxic because they
have high concentrations of metals and salts.
Acid precipitation is especially disruptive when it occurs in areas with______________ because of the lack of _____________.
granite bedrock; buffering capacity
Dioxins, pesticides, and polychlorinated biphenyls are all types of
toxic organic compounds.
The range of tolerance for temperature in an aquatic organism is likely to be _____ the tolerance range of a terrestrial organism.
In order to avoid producing thermal plumes, power plants often
warm entire rivers to ease temperature gradients.
The main reason that surface water pollution has largely decreased in the United States since 1950 is
the Clean Water Act.
In 1998, a change in the approach to water quality was initiated by _________ with an emphasis on _________.
the EPA; watershed management
Feedlots are a major cause of _________ in water.
A. viruses B. coliform bacteria C. nitrates D. phosphates E. All of these choices are correct.
All of these choices are correct.
______________ is an example of a natural process that is accelerated by human activities.
A. Eutrophication B. The weathering and release of toxic inorganic minerals from rocks C. The mobilization and concentration of soluble salts from groundwater D. Sediment loading of rivers E. All of these are examples of natural processes that are accelerated by human activities.
All of these are examples of natural processes that are accelerated by human activities.
Aquifers are especially susceptible to contamination
A. around wells. B. near their recharge zones. C. when they are shallow. D. around injection wells. E. All of these choices are correct.
All of these choices are correct.
The following statements explain why contamination of aquifers is dangerous. Which of the statements is false?
A. The contaminants are concentrated by the different densities of water in the aquifers. B. Pollutants are extremely stable once they contaminate an aquifer. C. Minuscule amounts of a pollutant can contaminate an entire aquifer. D. Aquifers can take an extremely long time to turn over their water content. E. All of these statements are true.
The contaminants are concentrated by the different densities of water in the aquifers.
Municipal sewage can be an excellent source of _____________ that are otherwise expensive to mine.
The potential problem with natural decay for human waste is that
it only works where population density is low.
__________ should never be allowed down a drain when a septic tank and drain field system is being used for sewage disposal.
Chlorine and antimicrobial cleansers
Primary sewage treatment involves
removing solids from water.
Tertiary treatment of sewage produces water that is usable for
Tertiary sewage treatment is designed to remove
nitrates and phosphates.
The advantage of effluent sewerage is that
since solids are removed, pipes and pumps to the central treatment plant can be small and cheap.
The city of Arcata, California, is notable because it designed a _________ to treat its sewage.
Using Bentonite slurries to stabilize liquids in porous substances is an example of
a containment method of remediation.
Using duckweed in a lagoon as low-tech sewage treatment plants is an example of
Best practical technology (BPT) is legally required for all
point source polluters.
Best available economically achievable technology (BAT) standards are standards set for
Wetland protection is one of the most controversial provisions of the ___________ because opponents believe that the legislation is _____________
Clean Water Act; an infringement on their use of private property
The cheapest and most effective way to reduce water pollution is to use technology to separate wastes for nonpoint sources.
Open sea bilge pumping and tank cleaning are legal ways to clean ships, once the ship is at least 300 miles off shore.
Sediments in rivers are especially harmful to Louisiana's coastal wetlands.