Multiple Choice: Read each item carefully. Choose the letter of the best answer from the given choices.
1. What is the basis for the division of the layers of the atmosphere surrounding Earth?
A. changing temperature
B. changing amount of oxygen
C. changing weather patterns
D. changing composition of gases
2. What is the most abundant element in the Earth's atmosphere?
A. argon
B. carbon dioxide
C. nitrogen
D. oxygen
3. Which layer of the atmosphere contains the ozone layer?
A. mesosphere
B. stratosphere
C. thermosphere
D. troposphere
4. In which atmospheric layer is most water vapor found?
A. troposphere
B. stratosphere
C. mesosphere
D. thermosphere
5. In which layer do virtually all weather phenomena take place?
A. exosphere
B. mesosphere
C. stratosphere
D. troposphere
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