References

First of all, we would like to thank all people who helped us to prepare this site.

1. The Changing Earth, Lye Keith, 2000
2. 1001 qestions and answers, Ardley, 2001
3. Our Planet, Susan Baker, 2001
4. www.nasa.org
5. www.wikipedia.com
6. Different articles, Ms. Bagheri (Our Science Teacher)

the picture of moon book