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Answer 1

Answer:

a) The Siberian Plain lies in the Northern lowlands. The plain is drained by three rivers namely Yenisei, Ob and Lena which flow into the Arctic Ocean. ... As a result the upper course of the river gets blocked and extends over the plains making it marshy and swampy.

b)  

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The mighty Yellow River has earned the name “China's sorrow” for its tendency to flood, with devastating consequences, over the centuries. ... The physical properties of fine sediment were poorly understood in river science, in part because few other waterways in the world had as much as the Yellow River.

Explanation: