A city with a population of 80,000 people covers an area of 10 miles by 12 miles. The city council
wants to determine if it has enough groundwater resources to supply its population at the U.S. average
rate of 1,400 gallons per person per day. Drilling has determined that there is a 20-foot thick aquifer
under the entire city with a porosity of 20% and a specific yield of 5%. The city geologist has
determined that the sustained yield is one-fiftieth of the specific yield. Up to how many gallons per
person per day can this city pump water without lowering the water table? (There are 640 acres in a
square mile and 325,851 gallons in an acre-foot.)
a. 1,251 gallons per person per day
b. 62,563 gallons per person per day
c. 100,101,427 gallons per person per day
d. 625,633,920 gallons per person per day
e. 5,005,071,360 gallons per person per day
A
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Considering the availability of ecosystem goods and services,
A) there are more ecosystem good and services per person now than there were in 1969. B) there is a greater "safe space" now than in 1969. C) the amount of ecosystem goods and services has declined between 1969 and the present. D) the pressure from continuing population growth is not as severe as predicted 40 years ago.
For which types of elements do we sometimes use the "ous/ic" system in naming ions?
A) alkali metals B) halogens C) noble gases D) transition metals
The lowest layer of the atmosphere is the ________
A) mesosphere B) troposphere C) stratosphere D) ionosphere
Compare and contrast marine environments that favor the deposition of siliceous and calcareous oozes
What will be an ideal response?