OK saw it. Its nicely done considering you are in 9th.
But here are the suggestions.
How long the presentation is.? (I mean how much minutes will be given when u present it.). Depending on the time increase number of slide.
2.) The use of graphics are necessary in presentations. Use graphics more.
3.) Avoid using small font size.
Are you going to give this presentation on a Projecter or this is just a HomeWork project. My suggestion will depend on that.
(I hav given a Presentation 2 months ago in my college. And I won.
So I have suggestion u might be interested in.)