________ has been the most important mechanism by which popular culture has rapidly diffused across the globe
A) Mass migrations
B) Radio technology
C) Word of mouth
D) Printed media
E) Television
Answer: E
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Which has a lower frequency than that of visible light?
A. Radio wave. B. Infrared wave. C. Microwave. D. all of the above
Which of the following best matches the description?Substances released into the atmosphere, which in their unmodified form are a health risk.
A. greenhouse effect B. particulates C. oxides of nitrogen D. acid deposition E. ozone F. thermal inversion G. sulfur dioxide H. secondary air pollutants I. radon J. photochemical smog K. primary air pollutants
Determining specific, quantitative dates for rock units or events expressed in years before thepresent:a
relative dating b. absolute dating
Deep scattering layers are best developed in regions with high surface productivity
a. True b. False