Use the following to answer questions:
Figure: Demand and Supply of Gasoline 
-(Figure: Demand and Supply of Gasoline) Look at the figure Demand and Supply of Gasoline. What might cause the supply curve to shift from S2 back to the initial supply curve S1?
Definitions:
Anterior Part
The front aspect or part of something, often referred to in the context of the body.
Vertebra
A bone in the spine that forms part of the vertebral column.
Vertebral Arch
The posterior part of a vertebra that encircles the spinal canal, composed of pedicles and laminae.
Spinous Process
A bony projection off the posterior (back) of each vertebra, which muscles and ligaments attach to, playing a role in movement and stability of the spine.
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