Many people decided to move from more rural areas that offered land and space for farming to cities that had factories and offered job opportunities
Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. Iron oxides and clay minerals accumulate as a result of weathering. In a soil, where substances move down from the topsoil, this is the layer, where they accumulate.
Note: This information has been taken out of a website.
This number tells us how many people would live within one square mile if the U.S. population were evenly distributed across its land area.
