If a layer is thermally stable, why can pollutants remain there for a long time?
Answer and explanation
Correct answer: Vertical mixing and washout are low
Thermal stability means that air resists vertical displacement. With weak convection, pollutants are not rapidly carried upward or diluted through turbulent mixing. In higher, relatively dry layers, rain-based washout is also limited, so particles and gases may persist. Therefore option B gives the relevant mechanism; pressure increase or burning is not a general explanation.
Frequently asked questions
What is the correct answer to this question?
Vertical mixing and washout are low
Why is this the correct answer?
Thermal stability means that air resists vertical displacement. With weak convection, pollutants are not rapidly carried upward or diluted through turbulent mixing. In higher, relatively dry layers, rain-based washout is also limited, so particles and gases may persist. Therefore option B gives the relevant mechanism; pressure increase or burning is not a general explanation.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
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