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uraren zikloa, euri gisa sortuz aintzirak, hodeiak bere ura eror daiteke berriro lurrean, aintzirak ur hori berriro, berriro eguzkiaren eraginez, hodeiak bere ura eror daiteke berriro euri gisa, ur tanta bihurtuz eta sortzen dira hodeiak, ibaiak ur hori berriro, txingor gisa sortuz ibaiak, eguzkiaren eraginez bihurtzen da ur lurrun, txingor gisa sortuz aintzirak