What caused the Dust Bowl? (Site 1)

    Poor agriculture practices, harsh weather, removal of grasses

Explanation:

    The Dust Bowl was caused by people getting rid of the tall grasses that covered Texas´s plains, these grasses had roots deep into the soil that held on to the soil preventing it from flying away in the plains great wind speeds, these grasses´s roots also held onto water and nutrients making the soil very fertile.   Another thing that caused the Dust Bowl was it´s hot weather and poor agriculture techniques.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof