Assertion A The convectional air currents rise upto the level of tropopause only Reason R The ...........

Geography World climates

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Assertion (A): The convectional air currents rise upto the level of tropopause only.

Reason (R): The normal lapse rate at tropopause drops to zero.

Select the correct code:

Both A and R is correct and R is correct reason for A.

Both A and R are correct, but R is not the correct reason for A.

A is correct but R is incorrect statement.

A is incorrect but R is correct statement.

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Explanation:

1. The troposphere is capped by the tropopause, a region of stable temperature. Air temperature after tropopause begins to rise in the stratosphere. Such a temperature increase prevents much air convection beyond the tropopause. So first statement is correct.

2. Lapse rate is rate of change in temperature observed while moving upward through the Earth’s atmosphere (troposphere to be specific).
The lapse rate is considered positive when the temperature decreases with elevation in troposphere, zero when the temperature is constant with elevation (tropopause), and negative when the temperature increases with elevation in stratosphere (temperature inversion)