Of the total energy that falls on their leaves, what percent do producers on average convert to chemical energy through the process of photosynthesis?
a. 0%
b. 1%
c. 10%
d. 25%
e. 50%
B
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A current of 60 hertz is
A. direct current. B. alternating current. C. either of these D. neither of these
Carbon dioxide concentrations in the Northern hemisphere fall from spring through autumn as carbon is taken up in growing plants, and rise through the winter as organic matter decays
Indicate whether the statement is true or false.
Why is crushed limestone used in the remediation of sulfide waste rock?
a. The limestone forms a highly impermeable barrier. b. The limestone neutralizes the acid that forms. c. The limestone converts to marble and can be sold. d. Native grasses and plants grow directly out of the limestone. e. The sulfide waste rock will oxidize into limestone.
During the late Paleozoic, the present-day North America, Europe, western Asia, Siberia, and perhaps China formed the northern continent of ________
A) Gondwanaland B) Greenland C) Laurasia D) Africa E) none of the above