Storing drinking water in a reservoir is beneficial because it ____.
A. reduces the dissolved oxygen level
B. makes water treatment unnecessary
C. allows suspended matter to settle
D. allows the water to be ionized by the atmosphere
E. increases populations of healthy coliform bacteria
Answer: C
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Garbologists have discovered that trash in landfills is slow to decompose. Why is this?
A. Trash is compacted so tightly that the warm temperatures foster the growth of mold. B. Trash is compacted so tightly that sunlight, water, and air are unable to reach it. C. Measures enacted to prevent landfill pollution slow decomposition. D. Trash is constantly mixed and turned over by bulldozers. E. Methods of determining this are faulty; waste in landfills does decompose quickly.
Before conservation efforts facilitated their comeback, the American alligator population was nearly completely wiped out primarily because of ____.
A. parasites B. diseases C. hunters D. land developers E. pollution
Which of the following vertical zones of a large coral reef has light intensity of about 20% of the surface intensity?
A) From a few centimeters to a few meters B) From a few meters to 20 meters C) From 20 meters to 50 meters D) From 50 meters to 150 meters E) Below 150 meters
Which statement about the formation of the magnetic field of Earth is true?
A) Its formation is a result of magnetic materials in the core. B) Its formation is a result of the movement of magnetic materials in the core. C) It constantly forms, is lost, and is regenerated. D) It is more strongly observable at relatively low temperatures.