How did huang rivers nickname river of sorrows reflect is impact on early chinese civilizations

How did Huang He rivers nickname river of sorrows reflect it's impact on early Chinese civilizations?

Answer > The Huang He River earned the nickname, “River of Sorrows,” because; the Chinese had to labor constantly to build, and repair levees that kept the river from overflowing. If the levees were to break, flood waters could destroy crops bringing mass starvation to the region.

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b. second continental congress

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.