Directions: Complete the puzzle below by writing down the word/s as described in each item.
Use a separate sheet of
your answers,
paper for
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1. the envelope of gases surrounding
POLL
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2. necessary for photosynthesis of pl
A
4. substance contaminating the envir
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6. where ozone layer is found
L
N
7. measures air quality
8. air quality if Aol ranges from 51 to
1
9. long-term heating of earth's climat
T I O S P H E RE
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Down
1. concentration of pollutants in the a
3. a gas essential to animals
5. introduction of harmful materials in
OU
environment
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