Ozone layer is above the earth crust around ?

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Q: 95 (RAS/2012)
Ozone layer is above the earth crust around ?

question_subject: 

Geography

question_exam: 

RAS

stats: 

0,12,33,19,10,4,12

keywords: 

{'ozone layer': [6, 0, 0, 6], 'earth crust': [1, 0, 0, 1], 'km': [0, 0, 2, 1]}

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