why river ob remains frozen for over six months of the year ?
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because of winter that is why frozen remain for six months
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Explanation:
ice forms on the OB from the end of October to the second week of November after which the lower reaches begin to freeze solid. By the last week of November the entire river is frozen the upper reaches remain frozen for some
150days the lower for 220.
The thawing of the ice which takes longer than the freezing last from the end of APRIL(Upstream) to the end of MAY and the spring drift about five days in duration produces considerable ice jams. The difference level between high water and low is 25feet(8m) at NOVOSIBIRSK on the upper Ob it reaches 43(14m) at ALEKSANDROVSKOYE on the middle Ob but decreases to no more than 20feet(6m) at SALEKHARD near the mouth. The water is warmest in JULY reaching a maximum of 82°F(28°C) in the vicinity of BARANAUL.
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