A hydrocarbon is
A. any organic molecule.
B. a molecule derived from hydrogen synthesis.
C. a wet carbon atom
D. a molecule composed of carbon and hydrogen only.
E. none of the above
Answer: D
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Ancient current directions can be determined by:
a. wave-formed ripple marks. b. cross-bedding. c. graded bedding. d. mud cracks. e. all of the above
Pennsylvanian rocks have a characteristic cyclical deposition sequence of ____ and ____ sediments
called ____. a. shale, carbonate, varves b. marine, nonmarine, varves c. carbonate, shale, cyclothems d. marine, nonmarine, cyclothems e. none of the above
The caudal fin shape that is asymmetrical, with most of the mass in the upper lobe, is a ________
A) rounded fin B) truncate fin C) lunate fin D) heterocercal fin E) forked fin
When air is heated it expands and ________
A) explodes B) contracts C) sinks D) lowers its pressure E) burns