quiz 3

The leading nonpoint source of water pollution is

• municipal landfills

• runoff from city streets and storm sewers

• agriculture

• industrial waste

• leaks from offshore oil wells .

what is the natural process of nutrient enrichment of a water body ?

• thermal inversion

• eutrophication

• point source pollution

• channelization

• oligotrophication

in cultural eutrophication, game fish die from

• acid deposition

• suffocation from lack of oxygen

• toxic substances in the water

• salinization

• habitat loss

which of the following helps to control cultural eutrophication?

• adding nitrates to balance the excess phosphates

• adding aquatic weeds to the water body to absorb excess oxygen

• increasing fertilizer use

• pumping remaining oxygen out of the reservoir

• limiting or banning phosphates in detergents

what do excess organic wastes and plant nutrients deplete from water

• nitrogen

• oxygen

• particular matter

• minerals

• iron

water pollution in less developed countries

• is mainly caused by untreated sewage

• occurs less frequently than in more-developed countries

• does not include industrial wastes

• does not include agricultural runoff

• should improve soon

which section of a stream is characterized by the absence of and found downstream from the release of oxygen-demanding wastes and heat?

• clean zone

• decomposition zone

• septic zone

• recovery zone

• dead zone

which of the following is true regarding lakes

• stratified layers of lakes are characterized by vertical mixing

• pollutants dilute better in lakes than in rivers and streams.

• lakes are more vulnerable than streams to contamination

• lakes are flushed more easily than streams

• flushing of lake usually takes days to weeks

what is the least expensive and most effective way to protect groundwater

• pumping it into the surface , cleaning it and return it to the aquifer

• inject microorganism to clean up contamination

• pump nanoparticles of inorganic compounds to remove pollutants

• use methods to prevent contamination

• use botteled water as a substitute

the majority of the oil pollution in the ocean comes from

• blowouts( rupture of a borehole of an oil rig in the ocean )

• tanker accidents

• fishriers

• runoff from lands

• normal operation of offshore wells