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An arid environment has a high Precipitation deficit, receiving much less precipitation annually than would satisfy the Climatological demand for Evaporation and Transpiration . This is mainly due to the high temperatures and few storms bringing rainfall. Regions are classified as arid if their Aridity Index falls between 0.05 and 0.20.

Most Desert s are Semi-arid , arid or Hyperarid , with the notable exception of Antarctica .