Hydrogen in fuel cells powers automobiles by
A) generating electricity.
B) creating rapidly combustible hydrogen compounds.
C) generating changes in gas pressures that move pistons in car engines.
D) combining with equal parts of gasoline to create a fuel with extra octane.
A
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Total world reserves of lithium are sufficient to last ________ years at current consumption rates
A) 12 B) 50 C) 200 D) 2,500 E) 500
Where are the more complex atmospheric cells located?
A) The equator B) The northern pole C) The mid-latitudes D) The southern pole
Geography embraces the study of virtually any global phenomena
Indicate whether the statement is true or false
What best explains why stream valleys become wider over time?
A. tectonic uplift causes valleys to widen naturally. B. streams get further above base level. C. meandering streams undercut their banks and cause mass wasting. D. stream velocity becomes greater over time. E. deposition of sediment creates a valley floor.