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Tunguska

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.25 sec.
Tunguska (tn-gs`kə), name of three eastern tributaries of the Yenisei Yenisei (yĕnĭsā`, Rus. yĕnyĭsyā`), chief river of Siberia, c.2,500 mi (4,020 km) long, central Siberian Russia.
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 River, Siberian Russia. The rivers cut across the swampy forests of E central Siberia, draining the Tunguska Basin Tunguska Event, a huge explosion that flattened hundreds of square miles of forest. It may have resulted from the catastrophic breakup of a stony asteroid about 100 ft (30 m) in diameter 5 mi (8 km) above the earth's surface.
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. Furthest north is the

Lower Tunguska, Rus. Nizhnyaya Tunguska (nyēzh`nyīŭ tn-gs`kə), c.1,590 mi (2,600 km) long. It rises in the Central Siberian Plateau N of Lake Baykal and flows past Tura to join the Yenisei at Turukhansk. Flowing generally west, it is navigable (May–October) for c.1,100 mi (1,770 km). The

Stony Tunguska, Rus. Podkamennaya Tunguska (pŭtkä`myĭnīŭ tn-gs`kə), c.980 mi (1,580 km) long, rises west of the headwaters of the Lower Tunguska. It flows generally NW past Baykit; there are rapids in its lower course.

Upper Tunguska, Rus. Verkhnyaya Tunguska (vĕrk`nyəyə tn-gs`kə), is the name given to the lower course of the Angara Angara (äng'gərä`, Rus. ŭn'gərä`), river, c.
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 River. It flows generally west and joins the Yenisei at Strelka. The area of the three rivers is the home of the Tungus Tungus (tnk
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.



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Large rivers (the Angara, the Lena, the Nizhnyaya Tunguska, the Selenga) freeze in October-November and open in May-early June.
To penetrate Earth's atmosphere, an asteroid would need to measure about 50 meters in diameter--roughly the size of one that exploded over the Tunguska River region in Siberia, Russia, in 1908.
We have evidence of this happening at the Tunguska site in Siberia.
 
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