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.