21) Which of the following affects the greatest number of people in the developing world?

A) water availability

B) lack of primary schools for children

C) inadequate sanitation

D) no childhood immunization for measles

22) A rural farmer most likely obtains drinking water by drilling a deep well to use:

A) gravitational water that has percolated through soil and accumulated as groundwater

B) gravitational water that is retained by the soil and accumulated just above the water


C) capillary water found in surface waters, located above the water table

D) capillary water that has percolated through soil and accumulated below the


23) About 99% of all liquid fresh water on Earth is found in:

A) lakes, including the Great Lakes of North America

B) rivers such as the Amazon, Nile, and Mississippi watersheds

C) underground aquifers

D) the upper few meters of topsoil

24) Which one of the following is fed by groundwater and often drained by seeps or springs?

A) lakes

B) aquifers

C) rivers

D) watersheds

25) In Costa Rica, a heavy downpour provides water that quickly evaporates or is absorbed and

released by the dense vegetation of the tropical rain forest. This is an example of a cycle


A) condensation, evaporation, transpiration, and green water

B) condensation, precipitation, and gravitational water

C) evaporation, gravitational flow, and adiabatic cooling

D) precipitation, gravitational flow, and convection


inadequate sanitation
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