Oasis, fertile tract of land that occurs in a desert wherever a perennial supply of fresh water is available. Oases vary in size, ranging from about 1 hectare (2.5 acres) around small springs to vast areas of naturally watered or irrigated land. Underground water sources account for most oases;
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Weather Words: 'Oasis Effect
Oasis
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Oasis - Wikipedia
Why the Oasis? - LabOasis
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