All of the following have been recognized as earthquake precursors except
A. changes in frequency of seismic sea waves.
B. changes in electrical resistivity of rocks.
C. changes in the ground's surface tilt.
D. changes in radon content of well waters.
Answer: A
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Which of the following molecules should have the same molecular shape and approximate bond angles as ammonia, NH3?
A. BH3 B. PH3 C. SO3 D. NO2 E. CH4
Which of the following is true of all lecithins?
A) Their fatty acids are all saturated. B) Their fatty acids are all unsaturated. C) There is always a phosphate group bound to carbon 1 of glycerol. D) There is always an unsaturated fatty acid bound to carbon 1 of glycerol.
Fallstreaks most often form with?
a. ?nimbostratus clouds. b. ?cumulonimbus clouds. c. ?stratus clouds. d. ?altostratus clouds. e. ?cirrus clouds.
The ozone layer is in that portion of the atmosphere known as the ________
A) troposphere B) mesosphere C) stratosphere D) heterosphere E) ionosphere