What are some good 7th grade science fair projects that have to do with earth science or physical science?

livin` ☮ lovin` ♥ laughin` ツ: What are some good 7th grade science fair projects that have to do with earth science or physical science?
I have to do a science fair project on a topic in our curriculum and this is earth science as in rocks and minerals, weathering and erosion, fossils, plate tectonics, earthquakes/ volcanoes. Also physical science as in waves, sound, light. I wanted to do my science fair project on something else but every suggested topic I find on the internet is about other things. So what are some interesting science fair projects in this curriculum? Thanks! =)

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Answer by Gary
This may be a little involved for a person of your age, ask your science teacher if a project in archeology would be ok. If he/she approves, then how about doing a mock up of what the city walls of Troy, Mycenae, or Tyrnes. A buddy and myself did a couple of these in High School and got A’s. It takes awhile to build it but man does it look great after you get the walls in place. Made out of clay, plaster of paris, and bathroom tile (1″x1″ brown). Get the Book “March of Archeology in your school library. I believe it is the one that contains a drawing of the different levels of Troy and its walls, as the same with the other two. Warning. Once you get into this Troy thing you may be hooked for life. The more you find out about those old cities and legends the more there is to find out. In other words it may become a lifetime project if you let it. Best Wishes for your project.