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.
Well dumping is a method, waste materials are dumped in open low labs away from the city.
Answer:
the center of the earth is called the core
Africa and USA because that’s what I think it is I had that question too
