eating your butt
The back of your science books often has ideas you can use,
what about UFO's
Yes
There are plenty of great 8th grade science fair projects. You could play with something like air concepts for example.
There are so many interesting ideas a 9th grader can do for a science fair project. One can do a project on whether gum helps you to concentrate, how carnivorous plants digest insects, or the effect of the overpopulation of guppies.
what kind
go to the site Google.com and ask good science fair projects
Go to sciencebuddies.com it has a lot of good ideas
electricity, chemical compounds and acid
The grade is up to how diligent you are. Below are some sites that have lots of science fair projects.
A good science fair project for a 6th grade level would maybe be something like the following: Does the average speed of a gymnast affect how their vault score? I'm trying to think of a good 7TH GRADE level gymnastics science fair project. advice?):
1. Momentum of a horse.