The fact that the trees in central Alaska look like the trees in western Siberia, despite being separated by thousands of kilometers, illustrates the theory of
A) convergent evolution.
B) multiple origins.
C) global dispersal.
D) plate tectonics.
A) convergent evolution.
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_______________ is a thick sludge composed of water, with particles of coal, rock, and clay.
Fill in the blank.
Photovoltaic cells do not produce any of the greenhouse or acid gas emissions associated with electricity generated by the combustion of fossil fuels
Indicate whether the statement is true or false
Deserts receive less than ______ centimeters of rain per year, on average
Fill in the blank(s) with correct word
Twenty centimeters of precipitation fell in one day on a southern city in the 100 years climatic records were kept in this city. This rainfall event ranked 5th among all one day precipitation events for this city. The return period for this extreme rainfall event would be
A. 5 yrs. B. 20 yrs. C. 4 yrs. D. 100 yrs.