Answered

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of the four river valleys that supported major early civilizations, which one lost one of its major rivers

Sagot :

demhaterz19
I'd say Indus Valley. There used to be River Saraswati whose course (bed) has turned to desert now. 
Yellow river is noted for changing course only. The other two (Nile, Shatt-el-Arab being confluence of Euphrates & Tigris) haven't changed course nor got lost.
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