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Multiple Choice Questions

What do you understand by the term air drainage ........

Geography and Environment (HAS) World climates

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What do you understand by the term air drainage?

Gravity induced downward movement of cold air from top of mountains to valleys resulting in temperature inversion.

Deflation hollows carved out by winds by removing loose sand particles in deserts.

Air drainage is the name given to the flow pattern of permanent winds over earth’s surface.

None of the given options is correct.

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Explanation:

1st statement is incorrect as Murmansk lies in higher latitude as compared to Newfoundland.
1st statement is correct regarding air drainage.
In mountain valleys, during long winter nights, air on higher slopes cool down quickly & become dense. Hence move down the slope & settle down at valley bottom, pushing comparatively warmer air up. Sometimes temperature at valley bottom falls below freezing point & air above at higher altitude remains comparatively warm. As a result, trees at lower slopes are mostly frost bitten than that of at higher slopes. Houses & farms in mountain valley are generally situated along the upper slopes avoiding cold & foggy valley bottoms. Air pollutants such as dust, smoke etc. do not disperse at valley bottom due to this reason.