__________ is a member of the Organization of Petroleum Exporting Countries (OPEC) and is one of the world's top ten oil-exporting countries.
a. Cote d'Ivoire
b. Ghana
c. Cameroon
d. Nigeria
e. Niger
d. Nigeria
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Which of the following physical features of the Rocky Mountain region were formed by volcanic activity?
A) Foothills and front ranges B) V-shaped valleys C) Calderas D) Moraines
Any change in the air's ________ content could alter temperatures in the lower atmosphere
A) smoke B) oxygen C) nitrogen D) carbon dioxide E) acid
A strong negative index for the North Atlantic Oscillation (NAO) usually means there is ________ of a pressure difference between the Bermuda (subtropical) High and the Icelandic Low pressure. This brings ________ than average temperatures over the northern U.S. and Northwest Europe.
A) less; cooler B) less; warmer C) greater; cooler D) greater; warmer
The longest divisions of geologic time are called ____
A)periods B)eras C)epochs D)eons E)stages