Name: 
 

Structure and Composition of the Atmmosphere- Problems


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
The ozone layer is about 
a.
50 miles above the surface. 
c.
100 miles above the surface.
b.
10 miles above the surface. 
d.
10-25 miles above the surface. 
 

 2. 
The ozone molecule consists of 
a.
1 oxygen and 2 nitrogen atoms. 
c.
3 oxygen atoms. 
b.
2 oxygen and 1 nitrogen atoms. 
d.
2 nitrogen and 1 oxygen atoms.
 

 3. 
The lowest layer of the atmosphere is the 
a.
troposphere.
c.
thermosphere. 
b.
stratosphere. 
d.
tropopause. 
 

 4. 
Ozone is concentrated in Earth's atmosphere at an altitude of 20 to 35 kilometers. Which atmospheric layer contains the greatest concentration of ozone?
(New York Regents)
a.
stratosphere
c.
mesosphere 
b.
thermosphere 
d.
troposphere 
 

 5. 
Oxygen started to be abundant about 
a.
1.8 - 2.5 million years ago. 
c.
1 million years ago. 
b.
5 million years ago. 
d.
0.5 - 1 million years ago.
 

 6. 
The ozone layer is in the 
a.
ionosphere. 
c.
stratosphere. 
b.
lithosphere.
d.
troposphere. 
 

 7. 
Which atmosphere component has the most variable abundance? 
a.
water vapor 
c.
nitrogen 
b.
argon
d.
oxygen 
 

 8. 
The atmosphere consists of 
a.
80% nitrogen and 20% oxygen. 
c.
70% nitrogen and 30% oxygen.
b.
78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide. 
d.
74% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide. 
 

 9. 
The stratosphere is characterized by 
a.
a slight temperature increase and lost of clouds.
b.
significant temperature increase and the absence of clouds. 
c.
a slight temperature increase and the absence of clouds. 
d.
significant temperature increase and lots of clouds. 
 

 10. 
What is the Dobson Unit? 
a.
Cloud researching device 
b.
Measurement unit for out gassing 
c.
A unit of ozone measure 
d.
None of the above is correct.
 



 
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