Which of the following features is composed of calcium carbonate?
A. travertine
B. cave formations like stalagmites
C. limestone
D. All of these choices are correct.
Answer: D
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Carcinogens, mutagens, and ___________ are toxic agents
Fill in the blanks with correct word
Why is groundwater in an aquifer a nonrenewable resource?
A. Once water is pumped out, it can never refill the aquifer because the rock changes its porosity. B. The water in an aquifer comes from ancient seas trapped underground. C. It can take thousands of years for rainwater to percolate downward to recharge the aquifer. D. It is vanishing from earth for no apparent reason.
All phytoplankton and seaweeds require ________ such as nitrogen and phosphorus.
A. inorganic nutrients B. micronutrients C. gases D. vitamins
Which of the following activities use the greatest amount of water in the United States?
A. electrical generation and industrial B. industrial and irrigation C. industrial and municipal supply D. irrigation and electrical generation E. irrigation and municipal supply