The West Nile virus is transmitted to humans by ____.
A. mosquitoes
B. houseflies
C. birds
D. physical contact
E. coughing and sneezing
Answer: A
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Mass extinctions at the end of the Ordovician occurred because of
a. dramatic changes related to glaciation. b. dramatic chemical changes in seawater related to meteorite impact. c. increased solar radiation. d. decreased solar radiation. e. none of the above
Which of the following statements is correct?
A) Landmasses have a higher temperature range than oceans. B) Oceans have warmer summer temperatures than land. C) The Southern Hemisphere has a larger temperature range than the Northern Hemisphere. D) Annual temperature range is largest near the mid-latitudes. E) Landmasses have warmer winter temperatures than oceans.
At present, most of the energy used in the United States is supplied by
A. fossil fuels. B. geothermal plants. C. nuclear power plants. D. hydroelectric plants.
All layers to be used together in a GIS operation must align spatially.
Answer the following statement true (T) or false (F)