Which plankton group are the most productive photosynthetic organisms (apart from cyanobacteria)?
a. dinoflagellates
b. coccolithophores
c. diatoms
d. ciliates
e. zooplankton
ANSWER: c
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If a machine consumes more energy compared to the amount of work it does, then it is considered to have low energy ___________.
Fill in the blank(s) with the appropriate word(s).
There is more gold in 1 km3 of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans?
A. It would cost too much. B. It is too dilute to separate. C. It would take too much energy. D. all of the above E. none of the above
Stacks are erosional remnants of headlands left behind as the coast retreats.
Answer the following statement true (T) or false (F)
What is the cold water phase of ENSO?
A. the Walker Circulation B. El Niño C. La Niña D. the PDO E. the NAO