marbles

‘Keep the child from eating the marbles.’
I heard this sentence.
Here Is the marble a chalk or crayon?
Thanks.

A marble is not chalk or crayon.
Perhaps you ought to look at the definitions in a dictionary and see if there is one which clarifies the matter.

Beeesneees,
When I refer to the dictionary, it says that the marble is a type of hard stone or a small ball of glass.
If that is the meaning, how can children eat the marble?
Please explain. Thanks.

The definition you need to apply is the small ball of glass.

Although a child cannot ‘eat’ a marble, young children in particular, would be likely to think of them as sweets and pop them into their mouths to suck on, which could have tragic consequences. This is why the sentence warns that this should be avoided.

Marbles:

In my country children often play marbles. Don’t they play in India?

baked clay

dictionary.infoplease.com/marble