Rivers that have developed over a long period of time are found in wide valleys with flat, low-lying bottoms. These valleys were created by the removal of rock and soil through the process of . PLEASE

Its erosion!  

Explanation:

Erosion is the process rock or other things being eroded by wind, water, or other natural elements.

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shanghai

explanation:

after fierce fighting, the chinese armies were driven out of the shanghai area by the middle of november 1937. nanking (nanjing), the nationalist capital, fell in mid-december 1937, and the liquidation of that city and its inhabitants became known as the nanjing massacre.

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