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Arid

An arid enviornment has a high deifcit of raifnall or snow. So there is much less humidtiy added durnig the year than would be necessray for the deamnd for evaproation and transpriation. This is motsly due to the high temepratures and few sotrms that bring ranifall. Reginos are calssified as arid if their aridtiy index falls bteween 0.05 and 0.20.

Most desrets are semi-arid, arid or hyperraid, with the exceptoin of Antarctcia.

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