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29 Cards in this Set

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The total amount of water on the Earth_______from year to year and the hydrologic cycle________.
stays about the same
moves it from one place to another
About ___ of the earth's surface is covered by water.
70 percent
Evapotranspiration is the way plants
return large amounts of water to the atmosphere.
Evaporation is
liquid water turning to vapor well below boiling temperature.
Natural evaporation processes are mainly driven by
solar energy.
The process of _____________ explains why your ice cubes shrink when they have been left in the freezer for a long time.
sublimation.
The amount of water vapor that air can hold_____ . Warm air is able to hold____humidity when compared to____ air.
varies greatly
more
cold
Saturation point is the maximum amount of water vapor that
air at a certain temperature can hold.
Relative humidity is a measure of water vapor in air compared to the
maximum vapor air can hold at that temperature.
The dew point is
the temperature at which a certain concentration of water vapor will begin to condense.
Condensation nuclei such as smoke or dust can make water vapor
condense more easily.
When temperatures are below 0°C, condensation
produces snow instead of rain or mist.
A band of deserts rings the Earth at about 23° north and south latitude because these are regions of
descending, warming air.
Most water in the atmosphere has evaporated from the ocean, and______rain falls back into the sea. About_____ percent of the earth's total rain falls on land.
most
10
The hydrologic compartment that contains the greatest amount of fresh water is
ice and snow.
Water enters groundwater by
infiltration.
The zone of saturation is the portion of groundwater where
all soil or rock pore spaces are filled with water.
The place where aquifers are most likely to be contaminated is at
recharge zones.
The amount of water in aquifers in the United States is
over thirty times greater than all surface water in the United States.
A country's renewable water supplies are generally made up of
surface runoff and infiltration into accessible aquifers.
Human water withdrawals have been increasing at about ___________ rate as worldwide population growth.
twice the
Which of the following statements regarding the water budget is true?:
About 40 gallons of water is consumed in commercial processing of a single egg.
US taxpayers pay for about 70 percent of the water piped to farmers in the Central Valley of California.
Most people in the world now have water piped to their homes, and it is rare for people to have to carry water for household uses.
All of these statements are false.
Agricultural conservation of water supplies is a good idea, but it would have little impact on overall water supplies.
About 40 gallons of water is consumed in commercial processing of a single egg.
Withdrawal of groundwater often causes subsidence, a situation where
porous rocks settle and ground level falls.
In some regions groundwater withdrawals can contribute to sinkholes, in which
empty underground caverns suddenly collapse.
Subsidence and sinkholes
are probably a permanent loss of an aquifer.
A method of increasing water supplies that has been successful, if expensive, is
desalinization by reverse osmosis.
Principal problems that have resulted from the construction of large dams include:

All of these.
evaporation and siltation.
the relocation of people.
mercury poisoning.
leakage and weakening of bedrock.
all of these
One of the consequences of the Aswan High Dam in Egypt is the:
increase in the need for buying fertilizer.
decline in the Mediterranean fisheries.
None of these.
All of these are consequences of the Aswan High Dam in Egypt.
increase in the occurrence of schistosomiasis.
all of these
The activity that uses the greatest share of US household water is:

flushing the toilet.