Orographic rain occurs when the air is cooled sufficiently as a result of

lifting due to flow over a mountain barrier.

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relative movement of two large air masses.

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violent upthrow of air arising from localized heating.

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cyclonic conditions.

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Solution

The correct option is A lifting due to flow over a mountain barrier.
Orographic rainfall occurs when moist air mass is forced to rise up due to the presence of mountain barriers. As the moist air rises, it cools down and condensate to form rainfall.

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