7th grade science fair scheme ideas are likely more involved than the projects you've done in old years. The science fair at your school is likely more contentious for your age group and there's a good chance your peers will be putting a lot more time and attempt into their projects than they have in old years, so you'll want to do the same for your 7th grade science projects.
One arresting idea might be to see which type of cheese mold will grow on the fastest. This is a great scheme because it's interesting, but still fairly simple. Someone else idea for a scheme might be to see if you can grow a plant without soil. You can try placing seeds in discrete things such as a wet paper towel, grass clippings, coffee grounds, etc to see if they will grow. Be creative!
You could find out either the presence of smoke in the air affects plant transpiration. Perhaps you could look into either or not there is ever acid snow, we all know there is acid rain, but what about snow? You can find this out by testing the Ph level of the snow and comparing it to the Ph level of acid rain. Obviously this singular scheme only works in the winter months. There are many great topics out there for your 9th grade science project, it's just a matter of looking one that interests you, researching and testing it out and presenting it in a professional manner.
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