The rudists that made up many of the organic reefs during the Cretaceous Period are a variety of
coral. Indicate whether the statement is true or false.
F
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The center of the North Atlantic gyre is
A. lacking in large fish B. surrounded by currents C. a zone of downwelling D. all of the above E. none of the above
Solids in wastewater treatment are removed in ________
A) tertiary treatment B) pretreatment C) secondary treatment D) sludge digestion E) primary treatment
Removal of ________ will always result in the greatest changes in an ecological system.
Fill in the blank(s) with the appropriate word(s).
You are hiking in the desert. Just when you think you have run out of water, you see a cool spring. As you sip from the spring, you are thinking:
A. "This spring is a source of point pollution." B. "Interesting…this spring is where the water table meets the land surface." C. "I may die from drinking this salt water." D. "This spring is a clue that rain has recently fallen here."