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Chapter 9

Chapter 9. Water Resources. Review: Hydrologic Cycle. Which of the following is incorrect regarding the hydrologic cycle? More water evaporates over the oceans than over land. Less precipitation falls over land than over the oceans.

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Chapter 9

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  1. Chapter 9 Water Resources Robert W. Christopherson Tim Schultz

  2. Review: Hydrologic Cycle • Which of the following is incorrect regarding the hydrologic cycle? • More water evaporates over the oceans than over land. • Less precipitation falls over land than over the oceans. • Over land, precipitation is greater than evapotranspiration. • Over the ocean, precipitation is greater than evaporation.

  3. Review: Water Budget • A potted plant is placed on a scale and its loss in weight is measured over the course of a day. What is being measured? • actual evapotranspiration • potential evapotranspiration • photosynthesis • soil-moisture storage • oxygen demand

  4. Review: Soil Moisture Storage • Which of these soil types has the greatest capacity to store moisture that plants can use? • sand • loam • clay-loam • clay

  5. Review: Water Budget • Plants in areas that experience periods when potential evapotranspiration exceeds precipitation, such as Kingsport, Tennessee, • wilt when POTET is greater than PRECIP. • are specially adapted to endure desert conditions. • draw on soil moisture to make up for the deficit. • store gravitational water during times of surplus. • hibernate until the return of surplus.

  6. This map displays global patterns of precipitation. evapotranspiration. insolation. runoff. groundwater storage. Review: Water Resources

  7. Review: Groundwater • When groundwater has been “mined,” which of the following has definitely occurred? • Water has been pumped from the aquifer faster than it is being replenished. • The aquifer has collapsed and can never fill again. • The upper layers have been removed to access the water resource. • A dam has created a reservoir to trap excess groundwater. • Salt water has infiltrated from the ocean.

  8. Review: Global Water Supply • A major issue with global water supply is • population concentrations generally do not correspond with areas of high runoff. • some water supplies are shared between countries, generating conflict. • much of the excess precipitation runs off during floods, unused. • all of the above • none of the above

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