Approximately what percentage of gas emitted by volcanoes is water vapor?
A. 25%
B. 1%
C. 10%
D. 70%
E. 45%
Answer: D
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Which of the following statements about carbon-14 dating is true?
A. Carbon-14 dating is very accurate because the amount of carbon-14 in the atmosphere is constant. B. Carbon-14 dating can be used to date stone tools as well as bone. C. Carbon-14 can be used to date anything younger than 50,000 years. D. all of the above E. none of the above
The weight of ice atop a continent can depress the depth of the shelf break. Indicate whether the statement is true or false
If an eddy found in the Gulf Stream is rotating counterclockwise, then it is:
a. a warm water eddy. b. a cold water eddy. c. a transverse current. d. an eastern boundary current.
What is the Fourth World?
A) countries that are often targeted for investment from the First World B) economically vital countries that have only one major export C) small countries, such as those in the Pacific Ocean D) the poorest countries of the Third World E) women and children