With the Air Pollution Control Act and the Clean Air Act's subsequent amendments over the past few decades, air quality in the U.S. with regard to criteria pollutants has
A) worsened, with all pollutants significantly increasing.
B) remained about the same for all pollutants.
C) significantly improved for all pollutants except lead, which has worsened.
D) greatly improved for all pollutants.
D
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An individual carbon-oxygen bond is polar. Yet carbon dioxide, CO2, which has two carbon-oxygen bonds, is nonpolar because
A. the molecule has an even number of electrons. B. the electron-pulls of the two oxygen atoms are equal and opposite. C. it has a greater symmetry. D. Two of the above are reasonable.
The salinity of seawater remains constant because
A. salinity measurement technology is unreliable. B. salts are removed from seawater about as fast as they are deposited. C. salts are included in the molecular formula of seawater. D. salts no longer form in the ocean.
The mechanism for plate movement is:
a. conduction of heat from the core. b. friction created by tidal forces generated by the Moon. c. conduction of heat within the mantle. d. convection of heat within the mantle. e. convection of heat within the core.
Most of the water falling as precipitation returns to the atmosphere by transpiration and evaporation.
Answer the following statement true (T) or false (F)