 
 <prompt> "An aquifer dey wia?" <response>: From di 1950s go so, plenti areas for di Great Plains don become productive crop-growing areas because of extensive irrigation for large landholdings. Di United States na major exporter of agricultural products. Di southern portion of di Great Plains dey on top of di Ogallala Aquifer, wey be huge underground layer of water-bearing strata wey date back to di last ice age. Center pivot irrigation dey used extensively for drier sections of di Great Plains, wey dey lead to aquifer depletion for a rate wey pass di ground ability to recharge. 