People with home septic systems often flush several cups of a powdered substance down their toilets every month or two to keep their systems healthy. These powdered substances most likely contain ________
A) chemicals that bind to heavy metals to keep them from leaching into the soil
B) acids that help to clean the insides of the walls of the pipes and septic tank
C) chlorine and other disinfectants that help to prevent soil contamination
D) bacteria and enzymes that help break down wastes
D
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Oil and gas migrate out of their source rocks and
A. down to areas of higher pressure. B. laterally into impermeable rocks. C. upward toward the surface. D. All of these choices are correct.
The EPA has recently set a strict policy of monitoring the Total Maximum Daily Load (TMDL) of nutrients in order to reverse eutrophication in
A) the Mississippi River. B) Everglades National Park. C) Lake Michigan. D) Chesapeake Bay.
Describe the main factors that determine seasonal temperature variations
What will be an ideal response?
An earthquake's epicenter is
A. the point of first break along the fault. B. the line along which the fault moved. C. the point on the far side of the earth, directly opposite the earthquake. D. the point on the earth's surface directly above the focus.