ch. 10 quiz
Which statement about using freshwater irrigation is correct?
Most irrigation systems are very inefficient.
Which of the following is NOT a point source of pollution?
agricultural field
Cultural eutrophication contributes to _____.
algal blooms
An underreported source of pollution in oceans comes from _____.
cruise ships
Earth's supply of fresh water _____.
includes surface water and groundwater
One reason why contaminated groundwater is very difficult to clean up is that _____.
it has very low levels of dissolved oxygen
Two-thirds of annual surface runoff is _____.
lost in seasonal floods
Which of the following is NOT a benefit provided by dams and reservoirs?
pathways for migrating fish
In time, _____ are expected to sharply reduce the amount of fresh water available to residents of northern California during hot, dry summers.
shrinking snowpacks
Which outcome would you expect when water is removed from an aquifer faster than it is replaced on a regular basis?
subsidence of land above the aquifer
"Freshwater scarcity stress" describes _____.
the amount of fresh water available in a region compared with the amount used by humans
What is the purpose of desalination?
to remove salt from seawater
Which activity represents the single largest home use of water in the United States?
toilet flushing
Virtual water is defined as _____.
water used indirectly during steps to produce goods people consume
What is true of composting toilet systems?
Composting toilets produce waste materials that can be used as fertilizer.