Discuss the specific actions that the EPA has taken to minimize the automobile emissions of lead, nitrogen oxide, and carbon monoxide
What will be an ideal response?
In 1976 the EPA began regulating lead emitted from automobiles, particularly after it was found to deactivate the catalysts in automobile catalytic converters. All automobiles manufactured after 1975 had to have a catalytic converter installed in order to help reduce the emissions of carbon monoxide, hydrocarbons, and nitrogen oxides. Since 1980, the use of leaded gasoline has now been banned in most countries, and global emissions of lead have decreased by 90% since 1970.
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On human time scales, nonrenewable resources ____.
A. may be considered inexhaustible B. can never be recycled C. are replenished by natural processes within hours D. are used without ever becoming depleted E. can be depleted much faster than nature can form them
According to the authors, the most important city planner of the 20th century was
A) Howard. B) Le Corbusier. C) Frank Lloyd Wright. D) Christaller. E) Lucio Costa.
Describe how submarine canyons are formed? Where are they formed? How have past ice ages
affected the formation of submarine canyons? What will be an ideal response?
Explain the chemistry of how limestone dissolves
What will be an ideal response?