Assertion : There are very small sporadic cha | vedclass

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(A) The earth and its atmosphere form a system. The total angular momentum of this system is conserved in the absence of external torques.$L = I\omega

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If both $Assertion$ and $Reason$ are correct and the $Reason$ is a correct explanation of the $Assertion$.

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(A) The earth and its atmosphere form a system. The total angular momentum of this system is conserved in the absence of external torques.$L = I\omega = 	ext{constant}$When large air masses shift within the atmosphere, the distribution of mass relative to the axis of rotation changes, which leads to a change in the total moment of inertia $(I)$ of the earth-atmosphere system.Since the angular momentum $(L)$ must remain constant, any change in the moment of inertia $(I)$ results in a corresponding change in the angular velocity $(\omega)$ of the earth.Therefore, the shifting of air masses causes small, sporadic changes in the earth's rotational speed.Thus, both the $Assertion$ and $Reason$ are correct, and the $Reason$ is the correct explanation of the $Assertion$.

$Assertion$ : There are very small sporadic changes in the speed of rotation of the earth.
$Reason$ : Shifting of large air masses in the earth's atmosphere produces a change in the moment of inertia of the earth, causing its speed of rotation to change.

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$Assertion$ : There are very small sporadic changes in the speed of rotation of the earth.$Reason$ : Shifting of large air masses in the earth's atmosphere produces a change in the moment of inertia of the earth, causing its speed of rotation to change.