Exam 6: Water on Earth

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Potential evapotranspiration is a measure of water demand.

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Warming temperatures can lead to both increases and decreases in lake levels.

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The largest practical potential source of fresh water in the world is

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The permanent removal of water from its source is known as consumptive use.

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About 50% of precipitation over the land infiltrates the surface,of which 75% returns to the atmosphere via evapotranspiration.

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There is little evidence to support that changes in the thermal structure of lakes may block the mixing between surface and deep waters.

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At wilting point,no water remains in the soil.

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The downslope,unchannelized flow of water across the surface is known as

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The utilization of aquifers beyond their flow and recharge capacities is known as

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The High Plains aquifer irrigates about one-fifth of all U.S.cropland.

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Capillary water is held in the soil against the pull of gravity by surface tension and hydrogen bonding.

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Which of the following is TRUE regarding freshwater on Earth?

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The main source of groundwater is

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Water is a renewable resource,constantly cycling through the environment in the hydrologic cycle.

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Soil permeability depends on soil particle size,shape,and packing of soil grains.

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Transpiration refers to the release of water to the atmosphere from Earthʹs crust.

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Precipitation intercepted by plants may eventually reach Earthʹs surface through stem flow.

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Precise measurements of evapotranspiration are difficult.

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The hydrologic cycle doesnʹt include water

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A confined aquifer is under the pressure of its own weight,creating a pressure level called the potentiometric surface to which water can rise on its own.

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