Which of the following is not a greenhouse gas?
a. carbon monoxide
b. water vapor
c. carbon dioxide
d. methane
e. nitrous oxide
Ans: a. carbon monoxide
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Why do some geologists believe a meteorite impact was not the sole cause of the extinction event at the end of the
Mesozoic? a. Iridium is not always found at the boundary between Cretaceous and Paleogene rocks. b. Meteorite impacts cause local extinctions, not global extinctions. c. The meteorite hit at the end of the Jurassic, while extinctions occurred throughout the Cretaceous. d. The location of an impact crater has not been discovered, and likely never will be. e. Terrestrial and marine extinctions have not been shown to occur at the same time.
If Earth were uniform (homogenous) throughout, seismic waves would ____.?
A) ?not travel from the site of an earthquake and stop at its origination point B) ?bend as it moves from the earthquake site toward the center of Earth and then back to the surface C) ?be reflected from the earthquake site after traveling half the distance to the center D) ?radiate from the site of an earthquake in straight lines
What is a playa?
A) a lake caused by a human dam B) a lake caused by a natural dam C) a lake above 8,000 feet in elevation D) a salty, shallow lake
Greenwich mean time (GMT) is a system of
A. determining what years should be considered leap years and which should not. B. determining when daylight savings time should go into effect. C. coordinating the rules for what time should appear on a clock, around the world. D. identifying the phase of the lunar cycle.