A) it warms the surfaces of leaves.
B) it is made possible by leaf veins.
C) the amount of transpiration that occurs is partially controlled by the plants themselves.
D) it is a water input in the water balance equation.
E) it operates in plants as ingestion does in mammals.
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A) 30 percent
B) 65 percent
C) 75 percent
D) 84 percent
E) 90 percent
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A) defines the volume of water in the oceans and lakes on Earth.
B) defines the flow of water between water bodies,but cannot be used to quantify the water in lakes and seas.
C) only describes how water moves from frozen to liquid on the continents.
D) is a system that describes and explains all water on Earth.
E) describes water volumes,but cannot define energy flows.
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A) increased temperatures
B) increased wind speed
C) increased humidity
D) increased water availability
E) decreased water availability
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A) collects solely as ice on the high mountain peaks and then begins its journey to the rest of the land.
B) quickly enters deep groundwater to be stored for future.
C) flows back to the ocean through subsurface conduits.
D) is carried back to the ocean over time by atmospheric,surface water and subsurface flows.
E) results in a lowering of the ocean surface.
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A) potential evapotranspiration exceeds actual evapotranspiration.
B) actual evapotranspiration exceeds potential evapotranspiration.
C) potential evapotranspiration equals actual evapotranspiration.
D) it is impossible to say what the normal relationship between potential and actual evapotranspiration would be in a desert.
E) there is no actual evapotranspiration in a hot desert.
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A) low porosity
B) low permeability
C) sand,gravel and rock with little cementing agent.
D) an abundance of clay arranged in tightly packed,horizontal layers
E) a deficit of surface water.
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A) a change in the level of the soil water zone.
B) a depression in the water table formed by rapid ground water withdrawal.
C) a depression in Earth's surface formed by ground water withdrawal.
D) a graphical representation of the decline in the rate of ground water flow as an aquifer dries out.
E) the sinkhole that develops after groundwater has been withdrawn.
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A) it is the smallest potential freshwater source in the hydrologic cycle.
B) it contains 7 times as much water as all the fresh water lakes in the world.
C) It contains water equal to that found in the atmosphere and rivers.
D) 75% of North America's population derives a portion of its fresh water from this ground water.
E) it is rapidly replenished from surface water sources.
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A) it is predicted that by 2025 humans will not have adequate water.
B) forecasts show that in the next 30 years humans will be able to manage sufficient water supplies from runoff.
C) in China,water shortages are a less serious problem than floods.
D) it is predicted that by 2050 available water per person will decrease by 74%.
E) water demands in rural areas continue to be a greater problem than in urban areas.
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