The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
Correct answer: B. 230
- A. 20
- B. 230
- C. 750
- D. 1500
Explanation
Atmospheric ozone is commonly reported in Dobson units, with a representative stratospheric value near 230 DU in many environmental-engineering references. The other values are far outside the usual atmospheric range.
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