The atmospheric layer containing about 75-80% of the mass of earth's air is the ____.
A. thermosphere
B. mesosphere
C. stratosphere
D. troposphere
E. tropopause
Answer: D
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Extending from Norway to the Pacific coast of Russia is a great expanse of ________ climate, often referred to as the taiga climate
Fill in the blank(s) with correct word
What is the major source of chlorofluorocarbons implicated in the thinning ozone layer?
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A) Namibia B) South Africa C) Ghana D) Ethiopia E) Botswana