Major natural extinctions are thought to have happened ________ in Earth history
A) never
B) once
C) twice
D) three times
E) innumerable times
Answer: E
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Carbon dioxide is abundant near the ocean surface due to the photosynthesis activities of plants
a. True b. False
In which of the following climates would vegetation be least likely to develop drought resistant characteristics?
a. low latitude desert b. humid continental, hot summer c. tropical savanna d. Mediterranean
Which of the following is true of thermohaline circulation?
A) They are deep currents caused by differences in temperature and salinity. B) The circulation has a definitive beginning and end, at the equator and poles, respectively. C) Due to t heir depths, they carry limited volumes of water. D) They travel at greater speeds than surface currents. E) They are largely wind driven.
The most abundant dissolved gas in magmas is H20.
Answer the following statement true (T) or false (F)