This alluvial plain's rich soil, deposited some 2 million years ago by the Mississippi River system, supports extensive agriculture.
(This alluvial plain's rich soil; deposited; T:some 2 million years ago; by the Mississippi River system) (This alluvial plain's rich soil; supports; extensive agriculture)
This alluvial plain's rich soil This alluvial plain's rich soil
deposited supports
T:some 2 million years ago by the Mississippi River system
extensive agriculture