Fertile soil along the Huang River starts out as a dislike material called​

Loess

Explanation:

Loess is a dust like materials that has a fine layer. It is very light and loosely packed which is where it gets its name because Loess means loose in German.

Loess is very rich in minerals because it is created by wind blowing dust and silt from place to place until they settle. In places like the Huang river, loess will eventually become fertile soil that is very useful for farming.

answer; ///(c) i believe that the correct answer is ethnic relations bear many similarities across different global; good luck

probably 3 since archeologists and historians don’t understand there writing.