From Wikipedia, the free encyclopedia
In meteurulugia, u cirru (o nivulu cirru) (latinu cirrus, abbriviazioni Ci) hè un nivulu di u pianu supranu di a trupusfera (à l'altitudina di 6000-12000 metri).
Ci hè parechji spezii di cirri. Si pò mintuvà: cirrus castellanus, cirrus duplicatus, cirrus fibratus, cirrus floccus, cirrus intortus, cirrus Kelvin-Helmholtz, cirrus spissatus, cirrus vertebratus
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