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Atmosphere Vocabulary - (Weather Book pages 1-14)

Define on index cards
1. The four most abundant gases in the atmosphere are:  
2. Weather                                              
3. Ozone  
4. Water Vapor  
5. Why is Earth's atmosphere necessary for life to exist on Earth?  
6. Mass  
7. Density  
8. Air Pressure  
9. Barometer  
10. Describe the difference between a mercury barometer and an aneroid barometer.  
11. What are the units of measure for air pressure?  
12. How does altitude affect air pressure?  
13. How does altitude affect density?