the removal of vegetation, especially on hillsides increases the risk of
which of the following is NOT an input control over cultural eutrophication?
harvesting excess weeds
can kill organisms adapted to a particular temperature range by thermal shock
which of the following is not a way to prevent or slow groundwater depleation
grow more water-intensive crops
economic benefits of building large dams include
production of renewable energy and storage of water for agricultural and domestic use (II and III)
throughout the world the most water is used for
increasing water efficiency can be accomplished in all of the following ways except
increasing government subsidies for farmers to pump water from rivers and aquifers below-market prices
over half of the total mass of pollutants entering streams and lakes comes from
nonpoint pollution from agriculture
which of the following pollutants are the result of human and animal waste contamination?
a good indicator of water quality is the number of
the water pollution and control laws enacted in the 1970s have done all but which of the following?
forced municipalities to take their water supply from the downstream side of the river
groundwater can be protected least by
using advanced sewage treatment
the oil company responsible for the oil spill of the Valdez was
Humans increase the likelihood of flooding by
all of these- draining wetlands, building on floodplains, removing water-absorbing vegetation, and urbanization
the ogallala aquifer
is being used faster than it is being recharged
dissolved oxygen in a body of water can be directly and indirectly depleated due to large amounts of
all of these- thermal pollution, organic wastes, sediments and suspended matter, and bacteria
which of the following is a nonpoint source of water pollution?
one chemical method for cleaning up oil spills is
which of the following is not a main factor in water scarcity?
fewer people withdrawing water from reliable runoff
FALSE STATEMENT- the amount of oxygen in rivers increases as the waters temp. rises
one class of pollutants that can cause a population explosion of aerobic bacteria is
oxygen demanding organic wastes
which of the following types of sewage treatment is properly matched?
advanced- physical and chemical processes
which of the following is not one of the ways that climate change can affect water pollution
it can improve water quality of the oceans for marine life and increase fish populations
what is not an effective way to reduce cultural eutrophication?
add nitrates to algal blooms
the term subsidence refers to
sinking of ground when water has be withdrawn
cancer corridor in louisiana contains how many hazardous waste sites?
FASTE STATEMENT- areas of a steam upriver from a point of discharge experience a septic or dead zone
the presence of fecal coliform bacteria in a sample of river water suggest which of the following?
the water is contaminated with animal waste
which of the following is a point source of water pollution?
offshore oil wells
the only effective way to protect groundwater is to
one class of pollutants that can cause excessive growth of algae is
inorganic plant nutrients
which one of the great lakes first showed intense effects of water pollution
the majority of the oil pollution of the ocean comes from
runoff from land
potential problems that may arise in a fully privatized water system include all of the following except
all are problems- lack of money and expertise, costly for public, using water as profit instead of conserving it
which stage of cultural eutrophication occurs last?
sources of groundwater contamination include
all of these- abandoned hazardous waste dumps, deep wells, and industrial and livestock waste storage lagoons
FASTE STATEMENT- groundwater is stationary and does not move
which of the following is an effective alternative to chlorine for disinfecting wastewater at a municiple treatment plant
the main human activity that increases flooding is
which of the following conditions in the himalayan watershed contributes to the flooding in bangladesh?
rapid population growth
which of the following statements about freshwater in the US is false
global warming will likely decrease water-use conflicts
FALSE STATEMENT- slow-flowing rivers are less susceptible to pollutants than fast-flowing streams
farmers can sharply reduce fertilizer runoff by
all of these- using prescribed amounts of fertilizer, planting nitrogen-fixing plants, planting buffer zones, control runoff
the leading nonpoint source of water pollution is
FALSE STATEMENT- water is one of the better-managed resources
oxygen sag curves
occur when oxygen-demanding wastes are added to the water
which of the following offers the greatest conservation of water?
micro-irrigation or drip irrigation
sustainable use of water involves
all of these- integrated governance of water pollution, participatory decision making, preservation of ecological integrity of water supply systems, and efficient use of water
what is the most ecologically responsible way to dispose of sewage sludge is
treating it with heat to kill harmful bacteria, removing toxic metals, and using it as fertilizer
which of the following directly decreases photosynthesis in bodies of water
for drinking water, the world health organization recommends what level of coliform bacterial colonies per 100 mililiters of water sample?
the most common problem encountered by seabirds coated with oil is
loss of buoyancy and insulation, causing deaths from exposure
which of the following statements about lakes is true?
lakes are more vulnerable than streams to contamination
to be considered safe swimming, what should the number of coliform colonies of bacteria by per 100 ml of water?
FALSE STATEMENT- inorganic nutrients such as fertilizers have no adverse effects of aquatic ecosystems
it is most economically and environmentally sound to focus water resource management on
increasing the efficiency in the way we use water
porous water-saturated layers of underground rock are known as