The northern temperate zone has two peaks for phytoplankton productivity in:
a. early summer and late summer
b. winter and spring.
c. spring and fall.
d. winter and summer.
c
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How many forces act on an upwardly tossed ball when it reaches the top of its path?
A. One; the force due to gravity. B. Two; the force due to gravity and the internal force in the ball. C. Two; gravity and the part of the force given by your hand initially. D. Three; gravity, the ball's internal force, and a turnaround force.
Why did the Christchurch earthquake (2011) in New Zealand cause much more damage than the larger Canterbury earthquake (2010)?
A) It was larger in magnitude and was deeper. B) It was closer to a large city with buildings that had been damaged by the earlier earthquake. C) A large landslide from the Southern Alps mountain range buried the capital city. D) All of these are correct.
Physical boundaries do not coincide with significant features of the natural landscape
Indicate whether the statement is true or false.
Which of the following best describes natural gas?
A) It can be converted to a liquid synthetic oil but costing many times more per barrel than conventional oil. B) It can be transported only in gas form, making the movement of natural gas over oceans impossible. C) It may help extend the oil economy by several decades. D) It cannot be used to power automobiles or public transportation.