The most important source of the free oxygen in our atmosphere is:
A) green plants that carry on photosynthesis.
B) deforestation.
C) volcanic degassing.
D) the dissociation of water vapor in the upper atmosphere.
Correct Answer:
Verified
Q31: Studies have shown that on average ozone
Q32: This atmospheric component absorbs damaging ultraviolet radiation
Q33: The ozone layer is found in the:
A)thermosphere.
B)stratosphere.
C)troposphere.
D)mesosphere.
E)ionosphere.
Q34: Scientists believe that a growing amount of
Q35: Which of these was NOT involved with
Q37: Consider the following diagram,and then answer the
Q38: Which one of the following gases has
Q39: This variable atmospheric component can exist in
Q40: Photosynthesis:
A)was prevalent during the first years of
Q41: 
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