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See also:SNOW (in O. Eng. sndw; a See also:common Indo-See also:European word; cf. in See also:Teutonic See also:languages, Ger. Schnee, Du. sneeuw; in See also:Slavonic snieg', Lith. snegas; Gr. vi4a, See also:Lat. nix, nivis, whence the Romanic forms, Ital. neve, Fr. neige, &c.; Ir. and Gael. sneachd; the See also:original sense of the See also:root may be to moisten, cf . Skt. sneha, moisture), that See also:form of precipitation of See also:water-vapour condensed from the See also:atmosphere which reaches the ground in a frozen and crystalline See also:condition . See also:Snow thus occurs when the processes of condensation and fall take See also:place at a temperature below 32° F . The crystals, which vary greatly in form, belong to the hexagonal See also:system . They are formed upon a See also:nucleus, in the same way as a raindrop, and sometimes reach the ground singly, but more commonly in small coherent masses or flakes . If in its passage from the upper atmosphere snow passes through a temperature above 32° F. it reaches the ground as See also:sleet or See also:rain (according to the degree of See also:heat encountered), and thus after a fall of rain over lowlands, the higher parts of mountains in the vicinity may be seen to have received the fall as snow . See further See also:CLIMATE and See also:METEOROLOGY; and for the transformation of snow into See also:ice under pressure, see See also:GLACIER . |
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