Mountain chains, such as the Himalayas, are direct result of two plates subsiding.
a. true
b. false
b. false
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Forced vibration produces resonance when
A. frequencies refract. B. frequencies match. C. waves reflect in unison. D. speeds match.
The process by which individuals and groups try to influence the decisions and policies of governments is
a. economics b. resource management c. politics d. ethics e. all of these answers
What evidence led scientists to believe that waves travel at a greater velocity inside Earth?
A) Studies of earthquake signals via sensors located deep inside drill holes prove it. B) Refraction of energy waves is most efficient at shallower depths. C) Refraction of energy waves is most efficient along short paths. D) Average velocity is faster when the seismograph is farther from the focus of the earthquake.
Photochemical ________ is (are) the result of gases reacting to ultraviolet solar energy in strong sunlight, and forming secondary pollutants
A) aerosols B) smog C) precipitation D) wind E) erosion