Question

Give reason why the lower courses and mouth of the rivers Ob, Yenisei and Lena remain frozen throughout the year.
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Answer 1

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 150 days, the lower for 220.

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Answer 2

Answer:

..because these rivers drain into the arctic ocean that has a very low temperature because it is situated in a polar region

Explanation:

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