Which of the following geologic periods was not a time of extensive anoxic bottom waters, pushing bottom-dwelling species to extinction?
A. Late Devonian
B. Cretaceous
C. Middle Silurian
D. Jurassic
Answer: C
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At what time of day is an air-mass thunderstorm more likely to develop?
A) midmorning B) midnight C) midafternoon D) pre-dawn
One concern that environmentalists have is that market-oriented environmental tools are
A. an inflexible took that won't reduce pollution levels. B. an excuse to implement strict limits on emissions. C. an excuse to allow pollution to be maintained or to grow. D. able to achieve desired reductions in pollution at a lower cost.
What do you call a house with window panes that automatically darken or lighten depending upon the outside temperature?
What will be an ideal response?
How are the principles of lateral continuity and superposition related?
A) They help to understand the processes that obstructs sedimentary layers. B) They help to extend relative age relationships over larger areas. C) They help to understand cross-cutting relationships. D) They help to show that sediment tends to accumulate in horizontal layers.