Many of the world's lake basins are products of ____
a. folding
b. stream erosion
c. glaciation
d. karst action
c
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Cow belching results in the release of methane, a greenhouse gas
Indicate whether the statement is true or false
An upper level trough is an indication of ________ air while an upper level ridge is an indication of ________ air
A) rotating; still B) cold; warm C) warm; cold D) sinking; rising
In general, between 1990 and 2010, the fuel efficiency of vehicles sold in the United States has
A) increased dramatically, nearly doubling in this 20-year period. B) increased by about 50%. C) showed only a slight increase. D) decreased by about 30% due to additional pollution control devices on exhaust systems.
Since 1880, the two years with the highest land surface temperature were
A) 1990 and 2000. B) 2005 and 2010. C) 1985 and 1992. D) 1900 and 1940.