Water most commonly percolates from ____
a. the zone of saturation to the zone of aeration
b. the zone of saturation to the zone of porosity
c. the zone of aeration to the intermediate zone
d. an aquifer to an aquiclude
c
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National recreation areas are part of
A. the National Park System. B. the National Wilderness Preservation System. C. National Wildlife Refuges. D. National Resource Lands. E. National Forests.
When energy changes from one form to another, it always goes from a more useful to a less useful form
Indicate whether the statement is true or false
The Cairo Plan calls for stabilizing the world's population at 7.27 billion by what year?
A. 2050 B. 2005 C. 2015 D. 2100
Slave labor was an integral part of the wealth the Europeans countries extracted from their colonies, wealth that fueled the Industrial Revolution
Indicate whether the statement is true or false