Un­even Dis­tri­bu­tion Of Pre­cip­i­ta­tion

Science Illustrated - - CLIMATE -

Earth's av­er­age an­nual rain­fall is about 1,000 mm, cor­re­spond­ing to 50,000 bil­lion tonnes of rain, snow, sleet, and hail. Most rain falls in the trop­ics, par­tic­u­larly where moun­tains force wet ocean winds to high al­ti­tudes such as in north-western South Amer­ica and the Bay of Ben­gal. The air is cooled with alti­tude and sheds its wa­ter vapour as rain. In­te­rior con­ti­nen­tal re­gions are far away from the wet ocean winds and of­ten re­ceive so lit­tle pre­cip­i­ta­tion that evap­o­ra­tion ex­ceeds pre­cip­i­ta­tion.

The trop­ics are of­ten struck by heavy rain, par­tic­u­larly in re­gions with high moun­tains.

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