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de OBVIOUS

nuvens psicodélicas: nacaradas

nacreous clouds

de Toptenz.net

Top 10 Unusual but Fascinating Cloud Formations

Polar stratospheric clouds (PSCs) form in the stratosphere at altitudes of 50,000–80,000 ft. They are classified into Types I (clouds with more diffuse and less bright colors) and II (nacreous or mother-of-pearl clouds), according to their formation temperature and particle size.