What are some ways that groundwater is used in the United States currently?
Human use of groundwater has _______ over time.
Groundwater overdraft occurs when _______.
Explain how groundwater overdraft occurs and its likely consequences.
What approximate percentage of the Earth’s freshwater is groundwater?
Compare the use of groundwater in preindustrial times to industrial times.
Why has groundwater use increased over time?
Aquifers are _______.
Explain the importance of groundwater as a source of freshwater.
Which of the following is not a source of groundwater pollution?
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