The short answer is that yes they can. However, you must be at least age 13 to register and join this site. You likely can still ask and answer questions as an unregistered contributor if you are under that age. But if you are below age 13 and join, you will be blocked as soon as this is discovered.
Based on the kinds of questions that are posted, there are certainly a lot of elementary aged children using this site. However, this site usually allows anyone over age 13 to register.
The following site should answer your questions - http://www.daycare.com/texas/
It is not the site that can not answer some of your questions it is the people.
no this site does not charge you for asking questions.
Doubtless many questions appear 'dumb' when you know the answer. Doubtless many 'dumb' children ask unnecessary questions. The reasons they do so are as varied as those that ask them.
Thinkquest is a site and the name of an annual competition to encourage children and teenagers to think of good scientific questions and find out the answers. It is used as an educational and information site.
BBgurlNY has asked 697,872 questions on this site.
Yes it is - but instruct them carefully about NOT eating it ( I never even thought people, even children would do that, till reading many of the questions on this site ! )
No. WikiAnswers was created by adults. However, there are children who actively contribute to the site, both in questions asked and answers given.
This site exists so that people can find answers to the questions they have
some of them but not all of your questions.....
Some children do it because they are immature. However you should be aware that the answer to a question that may be obvious to you may not be to others.