I believe check and balances. Not really sure.
Plantation farming because hunting and gathering is a form of subsistence
Islam spread to most of the Iberian Peninsula, and as far India in the east.
Answer:
The Valley and Ridge area of Georgia is located southwest and northeast of the Appalachian Plateau. The ridges are an extension of the mountainous northwestern part of the state. The valleys, formed in between the mountains, create fertile soil that is perfect for the farming found throughout this region.