The Montreal Protocol of 1987 was an international treaty that halted the production of ________.
a. carbon dioxide
b. nuclear weapons
c. water vapor
d. chlorofluorocarbons
e. automobiles
d. chlorofluorocarbons
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What is the approximate age of Earth?
A)10,000 years B)12.6 million years C)3.2 million years D)4.6 billion years E)13.5 billion years
Geography is often called the ____ science because it includes the recognition, analysis, and explanation of variations in phenomena as they are distributed on Earth's surface
a. Earth b. special c. spatial d. social
A person's ability to shiver is lost when his or her body temperature falls below:
A. 90°F (32°C). B. 92°F (33°C). C. 94°F (34°C). D. 95°F (35°C).
Concerning natural vegetation, which of the following is true?
A) It has not influenced human settlement. B) It has, worldwide, been heavily disturbed by humans. C) It does not influence microclimate. D) It does not reflect subtle variations in environmental parameters. E) It is usually exerts an overall negative influence on human society.