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17. Discuss the role of groundwater in the hydrologic cycle.
18. Why should we be concerned about how fast the
groundwater supply is being depleted in some areas?
19. Describe some ways to quantitatively measure the rate
of groundwater movement.
20. One concern geologists have about burying nuclear
waste in present-day arid regions such as Nevada is
that the climate may change during the next several
thousand years and become more humid, thus allowing
more water to percolate through the zone of aeration.
Why is this a concern? What would the average rate
of groundwater movement have to be during the next
5000 years to reach buried canisters containing radio-
active waste buried at a depth of 400 m?
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