Which of the following about improvements in air quality is correct?
A. Ozone levels have decreased greatly because there is less nitrogen gas in the atmosphere.
B. Lead emissions have decreased greatly because of the use of catalytic converters which remove lead from vehicle exhaust.
C. Carbon monoxide emissions have decreased greatly because carbon monoxide is destroyed by oxygen in the atmosphere.
D. Sulfur dioxide emissions have decreased greatly because power plants were required to reduce their emissions which caused acid deposition.
Answer: D
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Conservation is
A) the sustainable use and management of natural resources. B) maintenance of resources in their present condition. C) invention and diffusion of new agricultural practices. D) breeding programs to rebuild endangered species. E) maintaining wild environments.
Why would intrusive rocks chemically weather more quickly than extrusive rocks? Why would mafic rocks chemically weather more easily than felsic rocks?
What will be an ideal response?
Most of the countries experiencing food-security problems are in what region? (23 of the 28 countries are found here.)
A) Asia B) Middle East C) north Africa D) southeastern Europe E) sub-Saharan Africa
Volumetrically, the two principal sources of solid waste in the United States are wastes from livestock and from
A. municipalities. B. growing crops. C. mineral extraction and processing. D. industry.