Why was the Chinese river called the river of sorrow

Each year, over 1.6 billion tons of soil flows into the Yellow River, which causes the continual rise and shift of the riverbed. Before damming, it was extremely prone to flooding, and had caused millions of deaths, including the deadliest disaster in human history. sorry that its long

Explanation:

i got 3,4 and 5 as an answer

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.