I am going to assume you meant either 'what is it made of' or 'how is it formed' so I will answer this way to hopefully answer your question either way...
It is actually a part of the skeletal structure of the turtle and grows with the turtle as it grows, much the same as our ribs (which is what the shell of a turtle is) would grow when we grow. It is mostly bone with some cartilaginous growth. This is why we recommend you do not use paints, glues, or markers to decorate a turtle since it can weaken or even damage the shell, maybe not immediately but over time it could cause great harm to the turtle or tortoise...
To protect the tortoise.
His shell breaks when he has to jump to his home from up in the sky
you draw the tortoise and then rub out its body
The tortoise's shell is their home. The shell has a hard cover and can protect them when something hard hits it. If they do not have the shell, they would have died fast.
It is in the clock and it is the shell of a turtle
Unfortunately, it is a myth that turtles and tortoises can leave or change their shells. The shell is actually a hard, protective covering over the turtle or tortoise's ribs. So if you find an empty tortoise shell that means that that tortoise has died and decomposed.
That's why I asked you
Their shell (carapace) into which the tortoise withdraws as much as possible.
A tortoise goes about its life looking after its shell and the battering ram is covered with a shell/roof.
it has a soft shell
look in the shell
A tortoise shells size depends on how big the tortoise is, it's age and its breed.