Which of the following statements about change in ecosystems is true?a.Ecosystems experience change through human activity only.b.Ecosystems experience change through natural events only.c.Ecosystems experience no change.d.Ecosystems experience change through human activity and natural events.
The principle difference between point source and nonpoint source water pollution is _______.a.whether the pollution is organic or inorganicb.the number of sources of pollutionc.the amount of pollutiond.whether it is from commercial or agricultural sources
It is important to maintain septic systems in order to _______.a.prevent treated sewage from contaminating groundwaterb.process human waste into fertilizerc.prevent untreated sewage from contaminating groundwaterd.none of the above
Which of the following statements about turning points in environmental policy is true?a.Environmental policy has changed over time as a result of pressure from industry.b.Turning points in environmental policy were typically the result of urban expansion.c.Turning points in environmental policy have come about through increased public awareness.d.Environmental policy has changed little over the history of the United States.
Which of the following is a potential obstacle to the commercial development of brownfields?a.the presence of pollutantsb.environmental cleanup lawsc.the costs of environmental cleanupd.all of the above
The efforts of governments and businesses toward conservation and preservation have had a positive impact on the environment.
How does energy from the Sun travel to Earth?
Which statement describes the weather and climate in a tropical region?
Which statement best describes the availability of nonrenewable energy resources?
Most people in cities get their water _______.a.by supplying it themselvesb.by delivery through pipesc.through private suppliersd.all of the above
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Atmospheric Pollution
Energy in the Atmosphere
Air Quality