Why is groundwater in an aquifer a nonrenewable resource?
A) It can take thousands of years for rainwater to percolate downward to recharge the aquifer.
B) Once water is pumped out, it can never refill the aquifer because the rock changes its porosity.
C) It is vanishing from earth for no apparent reason.
D) The water in an aquifer comes from ancient seas trapped underground.
A
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Why is the Kuiper belt considered to be a zone of failed planet formation?
A. The dwarf planets found therein have yet to fully accrete all of the material in their orbital paths. B. There is simply not enough material within the dwarf planets' orbital paths for any of them to ever add up to full planetary status. C. Because none of the dwarf planets are massive enough to maintain an atmosphere. D. Both A and B are reasonable.
What is the mostly likely setting for this drainage pattern?
A) The rocks have a relatively equal resistance to erosion.
B) Drainages have followed a series of fractures that branch off of one another.
C) The area has folded or faulted rocks with different resistances to erosion.
D) A volcano once existed here but has been partly eroded away.
Which of the following sustainable factors helped to save America's forests from destruction during
the 20th century? a. conservation of forests by creation of the National Forest Service b. technology driven mass production of construction materials from plastics c. economic policies that allowed the importation of wood from tropical rainforests d. conservation efforts that resulted in a reduction in the demand for wood products e. overall decline in the United States population
Approximately what percentage of gas emitted by volcanoes is water vapor?
A. 25% B. 1% C. 10% D. 70% E. 45%