This is one of the questions that children will ask their teacher with and expectation of a precise answer.
This kind of question is belonging to a group of the most interesting questions because it has no precise answer. It is also good for children and teachers because, in that way, children can develop their imagination and the teacher can see in what way their knowledge is going. This question should lead children and teachers into the further investigation.
The teacher should tell his children that there is no wrong question and that every answer with a good imagination is a good answer.
