It varies. A snake's skin doesn't continually stretch as they grow, as ours does. The younger the snake - the more often it needs to shed in order to grow. A snake that's only a few years old might shed five or six times a year - whereas one that's over ten years old, may only shed once a year.
Corn Snakes? Yes, all snakes shed their old skin.
No. Most snakes do not. Most will shed their skin on the ground.
They regularly shed their skin its quite irreagular for them to shed skin though..
Yes.
Yes.
shed
As snakes grow the skin doesn't grow with them, so they shed the skin because it no longer "fits" them. By shedding the skin they can get larger, and grow.
dead skin
snakes
Every snakes skin shed looks kinda silvery when it is really fresh. As the shedded skin ages it turn a dirty yellow color.
All reptiles shed their skin. Reptile skin doesn't 'stretch' like ours does. Instead, when the current skin gets too tight, they grow another one underneath. They shed (or slough) the old skin, and the new skin allows them to grow a little more.
ALL snakes (and lizards) shed their skin periodically. The general rule is - the younger the reptile - the more frequently they shed. Reptile skin is regenerated all at once - not in tiny flakes like human skin. Thus they have to shed their skin in order to grow.