Grain elevators are large structures used to store and transport grain. They typically consist of a tall tower with a storage bin at the top, connected to a series of conveyor belts that move the grain from the ground to the top of the tower. The term 'grain elevator' is often used interchangeably with 'SILO, ' which is a four-letter word for a structure used to store grain. Silos are usually smaller than grain elevators and are typically made of concrete or metal.